HANDBOEK VOOR
INSTALLATEURS
Handboek voor de installatie van
VELUX dakvensters
Installers'
handbook
Preface
The purpose of this handbook is to provide an overview of the
installation of VELUX products.
The handbook describes the various aspects of roof construction in
association with VELUX roof windows and also provides advice and
information on how to obtain the optimal installation.
(Third edition, 2010)
The VELUX system
Chapter
1
2
3
4
Other products
Chapter
9
5
6
7
8
Contents
Planning
Considerations before choosing roof window Installation of a roof window
Installation step by step Integration – more windows
Combination of more than one window Special installation conditions
Installation in various roof constructions Special roofing materials
Installation in various roof materials Replacement / renovation
Replacement of a roof window Building physics
Roof constructions (humidity, heat, sound etc)
Product information
Short presentation of VELUX products 5-13
1
15-25
2
27-45
3
47-63
4
65-81
5
83-93
6
95-109
7
111-137
8
139-145
9
Other products
Sun tunnel / Flat roof window /
Solar hot water system
Contact VELUX
Addresses / Advising / Service
146-147
List of telephone numbers
148
Size chart
151
Planning
The construction of the house
User requirements
Building regulations 1
6-7
8
9-13
VELUX 5
1
Planning
The construction of the house
To be able to choose the right VELUX roof window for a given situation, it is always recommended to start from the construction of
the house, user requirements and current building regulations.
Normally, a standard VELUX roof window can satisfy the basic
requirements, but often choosing another window type or variant and/or choosing accessories can optimise the function and
increase the utility value of the window.
Planning must include the following aspects:
The distance between the rafters in the
roof construction usually decides the size
of the windows if cutting them and installing trimmers is not an option. Therefore,
first check whether the position chosen
and size of the roof windows fit into the
existing roof construction or if rafters will
need cutting (see pages 16, 48).
The roof pitch is important when choosing
windows and flashings. As a rule, VELUX
products can be used in roof pitches from
15° to 90°. However, there are exceptions
so always check whether the products
chosen can be used in the roof pitch in
question (see chapter 8).
The roofing material decides the type of
flashing to be installed around the window
to ensure a watertight installation. The
different flashing types are described in
chapter 8, pages 124-126.
When there is underfelt in the roof
construction, a tight connection must be
established between the underfelt and the
window frame to keep out water and driving snow. The easiest solution is VELUX
underfelt collar BFX (see page 21).
6 VELUX
Planning
1
The construction of the house
When the window is installed, insulation is
required to be provided around the frame
to allow for continuity of the insulation level
in the roof. The easiest and most effective
solution is VELUX installation set BDX (see
pages 19, 103).
It is essential that the vapour barrier in
the roof construction be connected to the
window. The easy and effective solution
is VELUX vapour barrier collar BBX (see
pages 25, 104-105).
A connection must be established from the
window frame to the interior ceiling finish
either in the same materials as the interior
ceiling finish or by installing a VELUX lining
(see pages 25, 59, 130-131).
In some environments, such as rooms with
high levels of humidity, there are special
requirements for the window. The correct
choice in these cases would be VELUX
polyurethane windows (see page 115).
VELUX recommends insulating glass units
with laminated glass on the inside for roof
windows installed at high level above areas
where people sleep, play or work. In case of
breakage, the lamination holds fragments
together (see page 136-137).
If there is a need for extra protection
against solar heat, VELUX offers insulating
glass units as well as internal and external
blinds, awnings and shutters with particularly good heat reducing qualities (see
pages 134-137).
VELUX 7
1
Planning
User requirements
Try to allow for a clear view when standing
and when seated. Note that the optimum
window size depends on the roof pitch.
Centre-pivot windows make it possible to
place furniture directly below the window
without obstructing operation of the
window.
Top-hung windows make it possible to
stand upright under the open window while
looking to the sides, providing extra headroom and maximising the feeling of extra
space. These windows are also suitable for
emergency escape/access purposes.
If the window is placed out of reach,
consider electrical or solar operation that
makes it possible to operate the motor for
window opening/closing as well as interior
and exterior sunscreening products with a
remote control (see page 110).
8 VELUX
Planning
1
Building regulations
means of escape
If specified for emergency escape purposes the roof window must
have an unobstructed opening of not less than 0.33 m2 with
neither the width nor the height less than 450 mm.
The sketch shows the position of the window within the roof plane.
NO
m
T
ax
AP
PL
17
SC
IC
OT
00
A
LA
B
m
ND LE
IN
m
AN
EN
D
GL
W
AN
AL
D,
ES
UNOBSTRUCTED OPENING
min 600 mm
max 1100 mm
Roof windows which meet the requirements;
GPL M06, M08, P10, S06, U08
GPU F06, M04, M06, M08, P10, S06, U08
GHL/GHUM06, M08, S06
VFA/B M34, M36, M38, P34, P36, P38, S34, S36, S38
Other sizes are also available.
VELUX 9
1
Planning
Building regulations
MINIMUM SILL HEIGHT REQUIREMENTS
The bottom frame of an opening window must be positioned at
least 0.8 m above floor level.
Restrictor locks can be used for centre-pivot windows with sills
below this level.
If the window functions as a means of escape/access, the bottom
frame must be positioned as shown on page 7.
VENTILATIon
In habitable rooms fresh air must be admitted for the health and
safety of its occupants. VELUX roof windows provide both purge
(rapid) and background ventilation to meet these requirements.
Additionally mechanical extraction is required in kitchen and bathrooms etc to rapidly remove large volumes of aqueous vapour.
Building Regulation requirements should therefore be checked as
to the provision of the correct amount and type of ventilation for a
room depending on its size and use.
10 VELUX
Planning
1
Building regulations
REQUIREMENTS FOR DAYLIGHT
To provide adequate levels of natural light, VELUX recommends
that the daylight area be at least 15 % of the floor area.
In Scotland every apartment must have a window or windows of an
aggregate glazed area equal to at least 1/15th of the floor area of
the apartment and situated in an external wall or roof.
SAFETY GLASS
The Building Regulations state that if glass is less than 800 mm
from the floor then glazing units with safety glass must be installed.
VELUX also recommends that where windows are installed at high
level in eg public places, the inner pane be specified as laminated
glass. This means that if the glass is broken the lamination will hold
the glass in place preventing it from falling. This is of particular
importance for schools, games halls, conference centres etc.
For optimum performance VELUX recommends the use of
glazing variants --73, --60 and --65 (see pages 136-137).
VELUX 11
1
Planning
Building regulations
SOUND INSULATION
To obtain sufficient sound insulation special requirements may be
necessary both in connection with choice of window variant and
with the installation (see also chapter 7, page 108).
Replacement of windows
In some areas replacement windows come under the aspects of the
Building Regulations. This means that application must be made to
the Local Authorities before the work can commence.
FENSA registered companies can however carry out replacement work immediately and then register the work with the Local
Authority on completion.
In all cases local planning requirements must be observed.
12 VELUX
Planning
1
Building regulations
REQUIREMENTS FOR SAFETY AT WORK WHEN
INSTALLING ROOF WINDOWS
H&S – WORKING AT HEIGHTS
In many cases VELUX roof windows may be installed from the
inside so that working on the roof is avoided.
In some cases it is, however, necessary to carry out part of the
installation from the outside, and in these cases it is important to
take the necessary safety measures.
As a principal rule protective measures must be taken on building
sites with a risk of drops of more than two metres. Therefore, when
working on roofs an effective protection against falling is almost
always necessary.
Scaffolding or a railing at the base of the roof may be a solution.
If the work on the roof is brief, fall protection (safety belt with
line/wire) may be used.
Which safety measures to be taken depend on the conditions on
the building site and are the full responsibility of the person(s)
involved in the work being carried out. The safety measures are
described in detail at www.hse.gov.uk.
VELUX 13
Installation of a roof window
Establishing opening
16-18
Exterior19-23
Interior
24-25
VELUX 15
2
2
Installation of a roof window
Establishing opening
POSITIONING THE WINDOW IN
THE ROOM
Position the window in the room considering:
• the use of the room
• a clear view when standing and/or when
seated
• comfortable operation (centre-pivot or
top-hung window)
• requirements regarding sill height,
see chapter 1
• vertical wall, if any, see page 59
• optimum design of linings
• building regulation requirements
HOLE IN THE ROOF
If there is no access to the roof from the
outside, establish a hole in the roof surface
by cutting a small hole, approx
400 x 400 mm, from the inside and
through the roof construction. When battens have been cleared, the final position of
the window in the roof construction can be
determined. When measuring, remember
to allow space for insulation around the
window frame.
POSITION OF TOP, BOTTOM AND
SIDE TRIMMERS – see chapter 4
POSITIONING THE WINDOW
If possible in order to minimise adjustment
of the roofing material, adjust the position
of the window sideways allowing for recommended distance to rafter (support) (a)
and roofing material (b).
16 VELUX
b
a
Installation of a roof window
2
Establishing opening
Adjust the position of the window
upwards/downwards depending on type of
flashing.
In roofs with:
•p
rofiled roofing materials, allow for a full
course of tiles below the window.
• slates,
ensure necessary overlap between
slates and flashing, see page 77 and installation instructions.
When deciding final position and dimensions of the hole in the roof surface, add
20-30 mm on all sides to allow for correct
insulation around the frame. Define hole at
top and bottom with installation battens
and at sides with rafters as shown in the
installation instructions.
HOLE IN UNDERFELT AND CEILING
FINISH
Roofing felt can be cut as shown and folded
in order to ensure water tightness.
In a roof with an existing ceiling finish,
project frame dimensions perpendicular to
the ceiling finish and mark. Cut hole. It is
necessary to cut a temporary hole in order
to install window.
Note that it must be possible to re-establish the vapour barrier within the existing
roof construction (if present) with the new
vapour barrier around the window.
The final adjustments of the hole in the
ceiling finish should not be made until
installation of lining.
VELUX 17
2
Installation of a roof window
Establishing opening
Removing sash
If installing the window from the inside the
sash must be removed.
Place the sash on a clean and even surface.
Installations from the outside can be carried
out with the sash in place.
INSTALLATION BRACKETS
Installation brackets are supplied with
the window or flashings for some specific
installations.
Window heights from -08 (1400 mm) and
upwards are supplied with additional installation brackets to be fitted at the middle of
the side frames.
The brackets must be fitted to the frame
prior to positioning the window in the roof.
Some products and combinations require
special brackets, eg:
• When the window is installed with
recessed flashings EDN and EDJ, special
brackets are supplied with the flashing.
• With some combinations of windows and
flashings, special brackets are supplied either with the additional window elements,
eg GIL, VFE, or with the flashing, eg EBW.
18 VELUX
Installation of a roof window
2
Exterior
FRAME INSULATION COLLAR
The frame insulation collar from installation set BDX 2000 consists
of four long pieces of polyethylene foam fitted on steel rails. Assemble the rails as a frame then position on the battens around
the roof opening before installing the window. It is then fixed along
with the installation brackets of the window.
If the free distance between the rafters is not sufficient, it may be
necessary to adjust the frame insulation collar to ensure correct
positioning. Adjust by tearing along the slit on the sides.
The frame insulation collar allows for the installation of VELUX
linings.
When using on-site linings the top and bottom parts of the frame
insulation collar may need to be adjusted by tearing along the slit
on the sides.
VELUX 19
2
Installation of a roof window
Exterior
FIXING AND ADJUSTING THE WINDOW
It is important to adjust the square and level of the window to
ensure a weathertight seal between the sash and frame and for
optimum operation.
Start by fixing the bottom frame to the lower installation batten
which should be level.
Adjust distance between frame and sash to ensure an even gap
at each side. Bottom frame and bottom sash must be parallel. If
uneven rafters cause the frame to twist, adjust frame using the
wedge supplied as shown in the installation instructions. If the roof
is not level, eg very lopsided/slanting, see pages 50-51.
Having adjusted the window, fix it as described in the installation
instructions.
20 VELUX
Installation of a roof window
2
Exterior
UNDERFELT
For the easiest connection to underfelt, use underfelt collar BFX.
The underfelt collar is made of diffusion open material and can
therefore be used for both ventilated and unventilated roof constructions.
Fix the underfelt collar to the frame on all sides, shape it around
the battens and fix it to the counter battens.
Position the drainage gutter immediately above the first continuous batten above the window so that it can drain off water from
the underfelt above the window.
a
b
c
Fit self-adhesive butyl strips supplied as shown (a) to seal the felt
where cut over the rafter.
Fold the underfelt collar and then the existing underfelt down into
the drainage gutter and fix with brackets supplied (b).
To position and fix the underfelt collar correctly below the window,
cut underfelt collar as shown (c).
VELUX 21
2
Installation of a roof window
Exterior
FLASHING AND COVERS
Fit flashing and covers in the sequence indicated in the installation instructions for the window and the flashing respectively. The
individual parts have a number on the back that in most cases also
indicates the installation sequence.
Note that there are left and right parts.
2
3
3
1
FLASHINGS FOR PROFILED ROOFING MATERIALS
When installing flashings for profiled roofing materials it is important that both foam gaskets and the flexible part of the bottom
flashing section fit tight to the roofing material to avoid drizzle,
driving snow etc entering under the flashing.
For installations using --W flashing variants it is recommended to
chamfer the roofing material below the window before fitting the
bottom flashing section (a).
Position the bottom flashing section temporarily and shape the
flexible part to the profile of the roofing material. Remove the flashing and then bend the flexible part (b) slightly before re-positioning
and fixing to the bottom frame of the window. Bending the flexible
part ensures a tight connection to the roofing material.
a
b
22 VELUX
Installation of a roof window
2
Exterior
Bend the bottom side flashing section at the sides (c). Especially in
shallow roof pitches this is important as an extra guarantee against
water ingress. The front edge of the flexible part of the bottom
flashing section may be dressed further to fit tightly to the roofing
material (d).
To allow for correct overlap between roofing material and flashing,
it may be necessary to remove a nib from the tile (e).
As you must not fit screws in the flashing, it may in some cases be
necessary to secure tiles with wire and/or adhere to adjoining tile
with appropriate sealant if possible (f).
c
d
e
FLASHINGS FOR FLAT ROOFING MATERIALS
When installing flashings in slated roofs or similar roofing materials, it is important that the bottom flashing section overlaps the
roofing material with at least the same overlap as applies to the
roofing material in general (a).
To provide the best possible drainage around the window, observe
the distances between roofing material and window stated in the
installation instructions (b).
a
b
VELUX 23
2
Installation of a roof window
Interior
CUTTING THE CEILING FINISH
When the window has been installed, adjust the hole in the ceiling finish to its final
dimensions. If using a VELUX lining, adjust
the hole by means of the template supplied
with the lining that ensures horizontal lining
at the top and vertical lining at the bottom.
This principle also applies to on-site linings.
ELECTRICAL OPERATION
Before fitting the interior lining finish, it
is recommended to fit a cable to prepare
for subsequent installation of electrical
products where necessary.
Run the cable through the pre-drilled hole
in the top frame. Fasten approx 20 cm of
the cable as shown. The rest of the cable
can now be led hidden to a position suitable
for subsequent connection to a control unit.
For cables up to 40 m, use eg a cable with
dimensions 2 x 1,5 mm2 (see also page xx).
Note! Electrical operation of top-hung windows requires a different wiring procedure.
Please contact VELUX.
INSULATION AROUND THE WINDOW
Correct insulation around the window is
important to avoid thermal bridges. Installation set BDX ensures the necessary frame
insulation. Use the wedge-shaped foam
gaskets supplied to close possible gaps
between frame and rafter.
If the installation set is not used, provide
corresponding insulation around the frame
up to the upper side of battens.
24 VELUX
Installation of a roof window
2
Interior
THE VAPOUR BARRIER
When a VELUX roof window is installed
any vapour barrier present is penetrated. It
must be re-established with a membrane
that connects the window to the vapour
barrier within the roof/wall construction.
VELUX vapour barrier collar BBX is the
easiest solution.
If the membrane used is not a VELUX
vapour barrier collar BBX, this membrane
must be connected to the window rebate
at the frame with butyl or acrylic joint filler
to ensure tightness. Where the window
aperture meets the interior ceiling the
membrane must be connected to the vapour barrier of the house by means of tape
or tight overlapping joint.
THE LINING
When establishing the lining between the
window frame and the interior ceiling finish,
try if possible to make the lining horizontal
at the top and vertical at the bottom. This
gives the best warm air circulation across
the inner pane surface, the best influx of
light and the best view.
When using VELUX linings, the lining is
assembled before being clicked into the
rebate in one piece.
VELUX 25
Integration – more windows
In general
28-29
Combi flashing EK-
30-31
Twin flashing EB-
32
Installation with support rafter EBY / EKY
33
Vertical window elements
Installation with adjustable support rafter EBY W10
34-36
37
Additional elements below roof window
38-41
Additional elements above roof window 42
Installation along roof ridge
43-45
VELUX 27
3
3
Integration – more windows
In general
Combining windows opens up many attractive solutions with
VELUX windows.
In general, installation of additional windows does not differ and
the same aspects should be considered and connection to the roof
construction should be made as described for installation of one
window, see chapter 2.
Note! The flashing is a very important element when combining
windows together and in some cases the installation instructions
supplied with the flashing also describes the installation of the
windows.
Therefore, always start by reading all installation instructions
before commencing work.
28 VELUX
Integration – more windows
3
In general
FLASHINGS
In general, a single flashing consists of a
bottom flashing section (1), side sections
(2) and a top flashing section (3).
Basically, the same components are used
when combining windows together. They
are, however, supplemented with components that ensure drainage between the
windows.
3
2
2
1
VELUX uses two drainage principles:
LOW-LYING MIDDLE GUTTERS
Flashings with low-lying middle gutters
drain off the water from the roof surface
above the window down both sides of each
individual window and the centre channel
between.
This principle makes it possible to combine
an unlimited number of windows in the roof
surface.
The principle is used for the combi flashing
system.
HIGH-LYING MIDDLE GUTTERS
Flashings with high-lying middle gutters
drain off the water from the roof surface
above the windows down the outer sides
only of the window combination.
This principle makes it possible to install the
windows closer to each other. This drainage
principle is used eg for twin flashing EB-.
The total width of a combination with highlying middle gutters must not, however,
exceed 2780 mm.
VELUX 29
3
Integration – more windows
Combi flashing EK-
The combi flashing system consists of seven basic elements that
make it possible to install from two to any number of roof windows
in combinations side by side or over/under each other. Windows to
be installed side by side must be of the same height and windows
to be installed over/under each other must be of the same width.
a
---4
a
---5
EB
---6
.
b
Volume / Weight
Made in Denmark
www.VELUX.com
---1
---2
---3
a = xx mm
a = XX mm
P
00AH10V
P
The seven basic elements have numbers referring to the last
number in the variant code of the flashing. Thus, EKW M08 0002
is the middle flashing element in the bottom row.
Distance "a" refers to the distance between the side frames
whereas distance "b" refers to the distance between top and bottom frames.
The distance "a" is as standard 100 mm, but combi flashings can be
ordered as special products with "a" distances from 60 to 400 mm,
with intervals of 10 mm. Distance "b" can only be 100 or 250 mm.
The distances must be stated when ordering the flashing. They will
be included on the flashing carton for confirmation.
Note! If "a" is less than 100 mm, the windows must be installed
with special brackets that are supplied with the flashing. Otherwise
the standard brackets supplied with the window should be used.
To allow for subsequent installation of a roller shutter on the
window, the distance "a" must be min 100 mm and "b" must be
250 mm.
As standard components, elements 1 and 3 are delivered together
in one carton under the variant code 0021 since both parts are
required irrespective of the numbers of windows being combined.
30 VELUX
Integration – more windows
3
Combi flashing EK-
WINDOWS INSTALLED OVER/UNDER EACH OTHER
Combi element 7 is used when installing any number of windows
over/under each other. Always use a single flashing for the bottom
window supplemented with combi element 7.
---7
W- - 0-94
---5
W- - 0-96
b
---0
---1
---2
---3
ASSYMMETRICAL INTEGRATION
By using asymmetrical flashing elements, windows can be installed
in a combination with more windows in the bottom than in the top
rows.
The asymmetrical flashing elements are used in the combi system
as a kind of substitute for the missing windows. Eg flashing EKW-- 0-94 is used instead of combi element 4.
Combinations with less windows in the bottom rows are possible –
in flat roofing materials with flashing EKL – and in profiled roofing
materials with flashing EKW. These combinations must be ordered
as special products; contact VELUX Company Ltd.
VELUX 31
3
Integration – more windows
Twin flashing EB-
Twin flashing EB- is used when installing two windows of the same
size side by side when a minimum frame gap is required.
As standard the two windows are installed with a frame distance
"a" of 18 mm. Frame distances of between 19 and 95 mm, are possible, however, please contact VELUX for further information.
a
a
The high-lying middle gutter makes it possible to install the windows close together. A support timber must be provided between
the windows.
If the distance "a" is 18 mm, it is advised that support rafter EBY
be used.
Follow the instructions supplied with flashing EB- when installing the windows. Adjustment of the position of the window is
described, however, in the installation instructions for the window.
Special brackets are supplied with the flashing.
Installation of more than two windows side by side is possible, but
please contact VELUX Company Ltd for further information.
32 VELUX
Integration – more windows
3
Installation with support rafter EBY / EKY
Use support rafters EBY/EKY to obtain a harmonious room side finish when windows are installed side by side with a frame distance
of 18 mm (EBY) or 100 mm (EKY). When using these support
rafters, trimmers must be installed to support the construction, see
chapter 4.
Support rafters EBY/EKY are available in three different lengths:
2000 mm, 2750 mm and 3500 mm.
A
B
max
775 mm
max
40 mm
Follow the installation instructions supplied with the support rafter
when installing the windows. However, adjustment of the window
is described in the installation instructions for the window.
When establishing the roof aperture and positioning trimmers and
support rafter, it is important that the support rafter is positioned
perpendicularly to the installation battens (A).
Observe the maximum dimensions stated when cutting the support
rafter in order to avoid weakening it unnecessarily (B).
If installation set BDX is used, the frame insulation collar must be
assembled and installed before the windows are installed.
EBY Only
The brackets used for connecting the windows are supplied with
the flashing.
Connect underfelt as if connecting around one window. Position the
drainage gutter immediately above the trimmer at the top to which
the support rafter has been fitted. Then proceed according to the
instructions supplied with flashing EB-.
VELUX 33
3
Integration – more windows
Vertical window elements
VERTICAL WINDOW ELEMENTS VFE/VFA/VFB WITH
FLASHINGS EFW/EFL
Vertical window elements VFE/VFA/VFB are always combined
with a roof window of the same width. The flashings for these
combinations are EFW/EFL.
Follow the instructions supplied with vertical window elements
when installing the windows. However, adjustment of the roof
window is described in the installation instructions supplied with
the window.
Special brackets for the roof window are supplied with the vertical
window element.
Note! When installing roof windows in combinations with vertical
window elements, the drainage of the roof must be considered, as
the course of the eaves gutter is interrupted. As the flashing drains
off the water to both sides of the windows, it must be ensured that
there is a downpipe on both sides of the interrupted gutter.
34 VELUX
Integration – more windows
3
Vertical window elements
POSITION IN FAÇADE
The roof window must be installed before the vertical window element. The template supplied with the vertical window element must
be used for determining the exact position of the two windows. The
optimum position of the vertical window ekement depends on the
façade.
A
B
C
a
min 130 mm
A I nstallation in brick, concrete wall etc: The vertical window elements VFE/VFA/VFB must be positioned at least 130 mm from
the façade of the house. This ensures that the top cover of the
window element lies behind the façade. It also makes installation
of an outer sill easier.
B Installation in façade with vertical wooden boarding (with
overlap): The vertical window elements VFE/VFA/VFB must be
positioned so that the outer edge of the side frames is flush with
the innermost layer of boarding.
C I n some cases, it may be necessary to cover the joint between
the bottom frame and the outer sill. For this purpose an additional cover part can be ordered as special product (a).
outer sill and drainage of bottom frame
The outer sill can be made in many ways depending on the façade.
It is important that there is a sufficient overlap between the bottom frame and the outer sill (approx 25 mm) to ensure that water
from the gasket level of the window can be drained off.
VELUX 35
3
Integration – more windows
Vertical window elements
ADDITIONAL VERTICAL WINDOW ELEMENTS
VFE/VFA/VFB WITH FLASHINGS EFW/EFL X99
Using flashings EFW/EFL X99, vertical window elements
VFE/VFA/VFB can be combined with any number of windows in
the roof and in the façade.
/EFS
EFW/EFL
15-55
55
50
45
40
35
30
25
roofhang
aushang
• Without
Dach
• Nie la vie
• Ce tagudhæng
• UdenTaaguthaang
• Nej fondiza
• Nio terasa
• Nuo
20
15
roofhang
aushang
• Without
Dach
• Nie la vie
• Ce tagudhæng
• UdenTaaguthaang
• Nej fondiza
• Nio terasa
• Nuo
The flashing must be ordered as a special product with exact
specification of the position of the individual windows. To ensure
sufficient drainage of the roof surface above the windows, there
are some limitations as to possible combinations.
A combination of windows with a total width of less than 2780 mm
will, as a single window, drain off the water to both sides of the
combination.
Combinations with a total width of more than 2780 mm require
drainage between the windows. This is established by inserting a
low-lying middle gutter and "box" gutter (A) that drains off water
separately to a downpipe.
A
a
x
max 2780 mm
36 VELUX
b
Integration – more windows
3
Installation with adjustable support rafter EBY W10
Adjustable support rafter EBY W10 is recommended for combinations including vertical window elements installed with a frame
distance 18 mm.
Adjustable support rafter EBY W10 can be used in roof pitches
from 15° tot 55°.
When using this adjustable support rafter, a trimmer spanning the
total width of the aperture is installed in the roof construction. The
adjustable support rafter takes over the support of the windows
while at the same time ensuring an elegant room side finish.
In combinations with additional adjustable support rafters the
total width of all windows must not exceed 2780 mm because of
the flashing.
VELUX 37
3
Integration – more windows
Additional elements below roof window
ADDITIONAL ELEMENTS GIL/GIU AND
FLASHING EXTENSIONS ETW/ETL
Additional elements GIL/GIU are installed immediately below the
roof window.
The flashing for this combination is a standard ED- single flashing
together with flashing extensions ETW/ETL.
Follow the instructions supplied with additional elements GIL/GIU
when installing the windows. However, adjustment of the roof window is described in the installation instructions for this window.
The additional element is supplied with special brackets.
Note that the frames of the roof window and the additional element must be flush to allow for subsequent fitting of linings.
38 VELUX
Integration – more windows
3
Additional elements below roof window
ADDITIONAL ELEMENTS GIL/GIU IN TWIN INSTALLATION
Two roof windows each with additional elements GIL/GIU can be
installed with a frame distance of 18 mm using support rafter EBY
and a variant of twin flashing EB-.
Twin flashing EB- must be ordered as a special product.
Follow these guidelines during installation:
1. Prepare hole and install necessary trimmers.
Width: X mm + 18 mm + X mm + 50 mm.
Height: Y mm + 920 mm + 45 mm.
X mm = window width, Y = window height
2. Install support rafter EBY according to instructions supplied
with EBY.
3. Install frame insulation collar from installation set BDX 2000
with extension pieces BDX W34 according to instructions supplied.
4. Install and adjust windows.
5. Connect windows to underfelt with underfelt collar BFX and
position drainage gutter immediately above upper trimmer to
which the support rafter is fixed.
6. Install flashing and fit covers according to instructions supplied
with additional elements GIL/GIU and the flashing.
It is also possible to integrate three windows side by side provided
that the total width of the window combination with high-lying
middle gutters does not exceed 2780 mm.
VELUX 39
3
Integration – more windows
Additional elements below roof window
ADDITIONAL ELEMENTS GIL/GIU IN
COMBI INSTALLATION
Roof windows with additional elements GIL/GIU can also be used in
combi installations with flashing extensions ETW/ETL and ETX as
supplement to the common combi flashing elements.
For example; if a Roof Balcony CABRIO® GDL is to be included
in a combi installation, additional element GIL must be installed
beside the balcony with a roof window (height -10) above. The total
length/height of these two windows corresponds to that of the
balcony.
40 VELUX
Integration – more windows
3
Additional elements below roof window
additional element gil above
vertival window element vfe
Vertical window element VFE can be installed below a combination
of a roof window with addtional window element GIL.
For this purpose, use flashings EFW/EFL together with flashing
extensions ETW/ETL.
As the sash of additional element GIL cannot be opened, it is necessary to remove it in order to fit covers between GIL and the vertical
window element.
Follow these guidelines during installation:
1. As the sash of the additional element GIL is secured with screws,
the screws must be loosened. Depending on the roof pitch, it may
be necessary to remove the sash.
2. Fit covers between the additional element and the vertical
window element.
3. Having fitted the covers, refit sash.
VELUX 41
3
Integration – more windows
Additional elements above roof window
Additional elements GIR/GID/GIV
Additional elements GIR/GID/GIV can be installed immediately
above a roof window.
The flashing for this combination is a standard ED- flashing without top flashing section and a variant of combi element 7 with the
relevant shape.
Roof windows with additional elements GIR/GID/GIV can be used
in combi installations with low-lying middel gutters. They may,
however, only be installed side by side.
Note that these windows cannot be used in installations with highlying middel gutters.
GIR
42 VELUX
GID
GIV
Integration – more windows
3
Installation along roof ridge
Installing windows along the roof ridge opens up to spectacular
combinations of VELUX roof windows – seen from the inside as
well as from the outside.
The procedure is simple:
The installation itself does not differ much from a standard installation and the same rules as to positioning the window in relation to
the roofing material must be observed.
Therefore, in tiled roofs always try to allow for a full course of tiles
below the windows.
When installing windows along the roof ridge, it is important to
know the "ridge measurement". This is the distance from the top
frame of the window to upper side of battens (red line) on the opposite roof surface. In the following this measurement is defined
as "A" mm.
Decide window size on the basis of this measurement.
A mm
VELUX 43
3
Integration – more windows
Installation along roof ridge
When choosing flashing for installations along roof ridge, the simplest solution is to use standard flashings (EDW, EDL, EDS) on each
side of the roof combined with a roof ridge kit (EKW --0 --88) to
ensure a watertight and harmonious integration over the ridge.
In case of more windows installed side by side, standard combi
flashings (EKW, EKL, EKS) are used in combination with one roof
ridge kit for each pair of windows over ridge.
Whether it is single windows or windows in
combination, the top flashing sections must
be adjusted depending on the distance "A".
The distance "A" must be 80-200 mm and
the roof pitch 15°-55°.
Note! Roof ridge kit (EKW --0 --88)
requires a ridge board to support the roof
ridge (especially in slate roofs).
If distance "A" is 200 mm or more, the
standard flashing can be used without any
adjustment. There is enough space for the
top flashing sections and the ridge tiles can
continue uninterrupted.
To make it possible to install the windows
closer to each other, use VELUX over
ridge flashing. This flashing connects two
windows of the same width across the ridge
and makes it possible to position the top
frames of the windows close to the ridge.
44 VELUX
Integration – more windows
3
Installation along roof ridge
The over ridge flashing is used with standard single or combi flashings and replaces the top flashing sections of these flashings. Note
that the over ridge flashing can only be used in roof pitches from
20° tot 50°.
As the over ridge flashing is made to measure for the individual
situation, is must be ordered as a special product. The order must
include a drawing/draft with the following information:
• roof pitch of each roof surface
• flashing variant (material)
• window sizes
• distance "A" measured at red-line-level
• if more windows are installed side by side, state frame distance "a"
When the windows are installed with the top frames close to the
ridge, note that the windows must be positioned in a way that allows them to be opened without the sashes colliding.
When using centre-pivot windows, this can be ensured by observing the following distances ("A" mm):
Window height
Roof pitch
780
mm
980
mm
1180
mm
1400
mm
1600
mm
20°
1)
1)
1)
1)
1)
25°
1)
1)
1)
40 mm
50 mm
30°
40 mm
40 mm
40 mm
80 mm
100 mm
35°
50 mm
70 mm
90 mm
120 mm
140 mm
40°
90 mm
110 mm
140 mm
170 mm
2)
45°
120 mm
160 mm
2)
2)
2)
up to 50°
2)
2)
2)
2)
2)
1) T
he windows can be installed frame-to-frame without risk of colliding
sashes.
2) V
ELUX over ridge flashing can only be ordered for installations with
distance "A" not exceeding 170 mm.
VELUX 45
Special installation conditions
Trimmers
48-49
Installation in lopsided roof
50-51
Connection to hard underroof
52-53
Half tiles below the window
54
Roof windows installed as dormer
55
Window installed as skylight
56-57
Mansard roof
58
Installation in connection with vertical wall
59
Flat roof
60-61
Atrium in flat roof
62-63
VELUX 47
4
4
Special installation conditions
Trimmers
If the window is wider than the distance between the rafters, it
may be necessary to install trimmers in the rafter construction.
In most cases when installing a trimmer to support a single rafter,
the solution is based on experience. Most often the trimmer has the
same dimensions as the rafters.
Note! Some constructions may require static calculations of the
load capacity of the new trimmer and remaining rafters.
Special conditions to consider:
• A large roof surface above or below the trimmer
• Existing trimmers in the roof construction close to trimmer
• Possible special support conditions of remaining rafters
For combinations of more windows side by side, it is often possible
to adjust window width and frame distances between the windows
in order to retain rafters. This must be determined before ordering
flashings.
Recommended distances to rafters to allow for effective insulation
around the windows.
20-30 mm
20-30 mm
48 VELUX
20-30 mm
20-30 mm
Special installation conditions
4
Trimmers
Good air circulation across the inner pane surface minimises the
risk of condensation. Circulation is achieved by a horizontal top
lining and vertical bottom lining to form a "funnel" leading air
across the pane. If trimmers are necessary, they must be positioned
in such a way that they do not obstruct the angled lining. When
using VELUX linings in roof pitches from 30° to 60°, trimmers must
be positioned outside horizontal (top) and vertical (bottom) level
measured from window frame as shown in illustration above to allow for correct installation of lining. In roof pitches shallower than
30° or steeper than 60°, the VELUX lining cannot be installed with
both horizontal top and vertical bottom as this will result in removing too much of the interior ceiling finish. Instead, the cardboard
template supplied with the lining is used for determining the right
position of the trimmer.
VELUX 49
4
Special installation conditions
Installation in lopsided roof
In old buildings with very lopsided roof constructions it may be
necessary to deviate from the standard procedure for adjusting
the window. The window should still be installed as normally but
consideration could be given to alignment with existing floor level
and roof.
Major local lopsidedness in the roof construction may also complicate adjustment of the window.
It may be necessary to elevate one corner of the window with more
than the height of the wedge supplied. In this case the entire installation batten must be elevated.
50 VELUX
Special installation conditions
4
Installation in lopsided roof
In this case the red-line-level of the window will lie above the upper
side of the battens resulting in a risk of leakage in the flashing if
this aspect is not taken into account.
Therefore, to even out the connection between the flashing and the
roofing material, it is necessary to "chock up" the battens around
the window.
VELUX 51
4
Special installation conditions
Connection to hard underroof
UNDERROOF OF MASONITE PLATES
Connection to underroof of masonite plates can be made either
with VELUX underfelt collar BFX or with standard underfelt in
rolls.
Note! If no counter battens have been used in connection with the
masonite underroof, it may be necessary to make a "frame" around
the window to which the underfelt or the underfelt collar can be
fixed. The "frame" can be made by placing infill battens between
battens along the sides of the window. Subsequently, the underfelt
or the underfelt collar can be connected below and along the sides
of the window as shown.
52 VELUX
Special installation conditions
4
Connection to hard underroof
Place underfelt/underfelt collar and drainage gutter above the
window so that they are overlapped by the nearest roofing plate
above the window.
UNDERFELT ON HARD BASE
Connection to underfelt on hard base – boards or sarking – can be
carried out with VELUX underfelt collar BFX as well as standard
underfelt in rolls.
Note! As in some cases an uninterrupted underfelt is required,
ensure sufficient drainage by fitting slat with screws and joint filler
as shown. This also ensures connection to the underfelt (in rolls) or
the underfelt collar BFX above the window.
VELUX 53
4
Special installation conditions
Half tiles below the window
Always try to allow for a full course of tiles below the window. If
conditions on site make this impossible, try the following options:
Cut tiles below the bottom frame of the window. Ensure support of
the end that has been cut as shown. It may be necessary to chamfer the tiles as shown in the installation instructions.
As the nibs have been removed from the tiles below the window,
the tiles must be secured to the battens with screws or nails.
Observe distances shown in the illustration.
150 mm
100 mm
When positioning the bottom flashing section it may also be necessary to shape the triangular part (a) to the same profile as the tiles.
Often, it will be necessary to use additional self-adhesive flashing
material (b) (not supplied by VELUX) to seal between bottom flashing section and tiles in the corners.
a
b
54 VELUX
b
Special installation conditions
4
Roof windows installed as dormer
VELUX roof windows and vertical window elements can be used
as an alternative version of a traditional dormer, providing more
daylight and ventilation.
This solution consists of the following VELUX products in clear
laquer or white painted finish;
•
•
•
timber roof windows GGL/GHL/GPL
timber vertical window elements VFE/VFA/VFB
adjustable support rafter EBY W10
in combination with flashing system for slate or tiled roofs in double or triple combination.
The VELUX dormer YWY is available in double or triple sets for
roof pitches 42°-52°.
For further information please contact VELUX Company Ltd.
VELUX 55
4
Special installation conditions
Window installed as skylight
When installing VELUX roof windows as
skylights, ie out of reach, consider choosing
electrically operated roof windows GGL
INTEGRA®/GGU INTEGRA® or GGL Solar/
GGU Solar.
Alternatively, it is recommended to lead
a cable to the window, see page XX. This
makes retrofitting of electrical accessories
such as window operators and electrically
operated decoration and sunscreening
possible.
The installation of the roof window follows
standard installation procedures.
Installation in light shaft
In buildings with unused attics, VELUX roof
windows can be installed as skylights by
establishing a light shaft.
Ensure all trimming work is carried out to
structural requirements where necessary.
Observe the following:
• The light shaft must allow the window to
be rotated 180 degrees to cleaning position, see illustration below.
Window size Size/cm
Roof
X02 X04 X06 X08 X10 X12
pitch
78 98 118 140 160 180
A
56 VELUX
15°
0
0
0
0
0
0
20°
0
0
0
0
0
0
25°
0
0
0
0
2
3
30°
0
0
0
2
3
5
35°
0
0
2
3
5
7
40°
0
0
3
5
7
11
15
45°
0
2
5
7
11
50°
0
3
7
11
15
19
55°
2
5
11
15
19
24
60°
3
7
15
19
24
30
65°
5
9
19
24
30
36
Special installation conditions
4
Roof window installed as skylight
•P
rovide vapour barrier to shaft. Connect
to roof window rebate and existing ceiling
vapour barrier if present.
• Insulate the shaft and depending on the
insulating material establish a wind barrier
on the exterior of the shaft.
•A
s the windows are installed out of reach,
white finish polyurethane windows GGU
requiring a minimal amount of maintenance are ideal.
When determining position of the light shaft,
consider supported walking areas, ventilation channels, chimneys and antennas/aerials within the roof space/construction.
Ensure all trimming work is carried out to
structural requirements where necessary.
VELUX 57
Special installation conditions
Mansard roof
Installation in a mansard roof does not differ much from a standard
installation. Several types of roof windows can be installed in vertical position without problems.
The mansard roof offers the opportunity of spectacular installations, eg two windows can be installed on either side of the "break
point".
Special flashing components that make this possible are available
from VELUX. The distances indicated must be observed.
When contacting VELUX, state roofing material and roof pitches of
both roof surfaces.
mm
12
125
4
58 VELUX
5m
m
Special installation conditions
4
Installation in connection with vertical wall
There are special aspects to be considered when installing a window with lining in connection with a vertical wall. If using VELUX
linings, these guidelines may be followed:
If the distance (measured
horizontally) from the vertical
wall to the interior edge of the
bottom frame is more than
50 mm, use a VELUX standard
lining or alternatively an on-site
lining.
min 50 mm
If the bottom frame lies within
the distances shown to the
vertical wall, use a VELUX
standard lining installed with
bottom element perpendicular
to bottom frame or alternatively an on-site lining.
max 50 mm
max 130 mm
If the bottom frame lies within
the distances shown from the
angle of the wall, use a VELUX
standard lining together with
a VELUX vertical wall element
LEI or alternatively an on-site
lining and sill.
max 250 mm
130 - 500 mm
If the bottom frame is positioned
as shown, a VELUX standard
lining can be used together with
a special made-to-measure
VELUX vertical wall element LEI
with a sill depth of max 750 mm
or alternatively an on-site lining
and sill.
More than
500 mm
VELUX 59
4
Special installation conditions
Flat roof
Use VELUX Flat Roof Kerb ECX for installation of VELUX roof windows in flat roofs. The Flat Roof Kerb can be used in roofs with a
pitch of between 0° and 15° and allows you the flexibility to select
the most appropriate type of roof window for the application.
The kerb is made of insulated plywood and is normally flashed
externally with the same material as the roof covering. This is then
overlapped by the flashing components provided with the system.
An on-site lining is used to finish the kerb internally.
60 VELUX
Special installation conditions
4
Flat roof
The Flat Roof Kerb comes in ten standard sizes. Typical opening
sizes required in the roof are shown below.
X
200 mm
71 ½ °
71 ½ °
H
W
105 mm
H
W
W mm
H mm
X mm
ECX C02
600
940
479
ECX C04
600
1150
543
ECX F06
700
1360
606
ECX M04
800
1150
543
ECX M06
800
1360
606
ECX M08
800
1590
676
ECX P10
1000
1810
740
ECX S06
1200
1360
606
ECX U04
1400
1150
543
ECX U08
1400
1590
676
VELUX 61
4
Special installation conditions
Atrium in flat roof
ATRIUM
It is possible to install VELUX roof windows in flat roofs (roof
pitches form 0° to 15°) to produce an atrium type effect. However,
this installation requires special cover and flashing components
that must be ordered as special products.
Cover and flashing components are based on a kerb construction
similar to VELUX Flat Roof Kerb ECX.
The kerb for the atrium is not part of the VELUX product programme and should be made on site. Certain dimensions must be
respected, see drawings opposite.
The dimensions of the kerb vary depending on chosen window sizes
and frame distance.
Before installing the windows, ensure that the construction is
structurally stable.
Install the windows according to the installation instructions for
the window. Supplementary instructions are enclosed with the
special flashing.
62 VELUX
Special installation conditions
4
Atrium in flat roof
Various options are available as to the combination of window sizes
and frame distances. It is advised to contact VELUX Company Ltd
in the first instance to discuss the specific requirements.
Note! The pitch of the window in the kerb must always be 20°.
Section, bottom
47 m
m
Section, top
Section, side frame
Section between
windows
Section between
windows of installation with VELUX
support rafter EBY.
The solution can be
used when the total
length of the light
band does not exceed
2780 mm.
52 m
m
87 mm
a
a
a = 18 mm
VELUX 63
Special roofing materials
Roofing felt
66-67
Unfelted roofs
68
Principle for adjustment of roofing sheets 69
Profiled metal sheets 70-73
Metal sheets with pre-formed standing seam
74
Decra roofing panels 75
Traditional standing seam roofs
76
Slate 77
Thatched roofs
78-79
Grass roofs and the like
80-81
VELUX 65
5
5
Special roofing materials
Roofing felt
Use flashing EDL/EBL/EKL for installation of VELUX roof windows
in roofs with roofing felt and a roof pitch steeper than 15°. The
flashing must be positioned between the roofing felt layers with
correct overlaps which means that the order below must be
observed.
IN NEW ROOF
After having finished the boarding or sarking, and establishing
window aperture in roof, install the window.
1 P
osition bottom layer of roofing felt on the roof surface around
the window. Ensure that the roofing felt covers approx 50 mm of
the frame on all sides.
Note: Use a cold adhesive instead of naked flames that might
damage the window and the frame insulation collar from installation set BDX, if any.
2 P
osition top layer of roofing felt below the window – butt the
roofing felt to the bottom frame.
3 F
it flashing EDL. Distribute side soakers evenly along the sides of
the window.
4-5-6 P
osition top layer of roofing felt at top and sides of the
window.
IN EXISTING ROOF
Installation in existing roof follows the same principle as in new
roof with a few exceptions.
• C
ut hole in existing roofing felt where the window is to be installed (see installation instructions) and install the window.
• P
osition four strips of roofing felt and lead it approx 50 mm up
the frame all the way round.
• Fit flashing EDL.
• P
osition top layer of roofing felt along sides and above window. It
is recommended to continue the roofing felt to the ridge to avoid
horizontal edges in the roofing felt.
66 VELUX
Special roofing materials
5
Roofing felt
1
2
150 mm
3
4
5
6
VELUX 67
5
Special roofing materials
Unfelted roofs
When installing roof windows in older roofs where roofing felt may
not be present it is still advisable to use an underfelt collar such as
VELUX underfelt collar BFX around the window. Alternatively, use
underfelt material in rolls.
The underfelt collar must end under the bottom flashing section.
Lead the collar to the second row of tiles at the sides of the window and roll it to form a "sausage" that ensures a tight connection
under the top of the tiles as shown. Fix the collar to the window
with butyl strip and staples. Tape overlap with a suitable tape.
68 VELUX
Special roofing materials
5
Principle for adjustment of roofing sheets
Use flashing EDW for installation of VELUX roof windows in roofs
with profiled roofing sheets, eg Eternit sheeting.
Adjustment when a whole roofing sheet below the window is
possible:
Position flashing around the window (ill. 2). For information about
installation battens and distances to the roofing material and other
elements in the roof construction, see installation instructions for
roof window and flashing respectively.
1
2
3
4
Adjustment when a whole roofing sheet below the window is
not possible:
Cut the sheets 100 mm below the window. Then finish installation
as shown below. Position flashing around the window (ill. 2).
1
2
3
4
VELUX 69
5
Special roofing materials
Profiled metal sheets
Use flashing EDW for installation of VELUX roof windows in roofs
with profiled single skin metal sheets that are uninterrupted from
eaves to ridge of roof.
0
10
m
m
Cut roofing sheets 100 mm below the bottom frame. Install
window on installation battens observing distances as shown in the
installation instructions for the window.
70 VELUX
Special roofing materials
5
Profiled metal sheets
Install the flashing around the window and shape the bottom
flashing section as shown in the installation instructions for the
flashing (a).
Position roofing sheets uninterrupted from the bottom frame to
the roof ridge along the sides and above the window. Observe
distances from roofing material to window frame as shown in
the installation instructions for the window and adjust the foam
gaskets of the flashing (b).
a
b
VELUX 71
Special roofing materials
Profiled metal sheets
If removing roofing sheets as shown on the previous pages is not
possible, use the following method.
X mm
30-60 m
45
mm
Y+
-15
0
mm
Establish hole for window as shown.
60
5
m
30-60 m
m
80 mm
Min
270
m
m
Cut the metal sheets. The distance from the installation batten to
the metal sheet roof must be 80 mm. Extend the cut at least
270 mm on both sides of the window to make room for the entire
bottom flashing section.
Note that the end of the cut must finish on the highest level of the
roofing sheets.
The distance from the side frames to the metal sheet roof must be
30-60 mm. The distance from the top frame to the metal sheet
roof must be 60-150 mm.
Position the top flashing section under the metal sheets before
installing the window frame. Adjust foam gasket.
72 VELUX
Special roofing materials
5
Profiled metal sheets
Install window as shown in the installation instructions for the
window.
Position side flashings under the metal sheet roof and under the top
flashing section. Remember to adjust foam gaskets.
Bend the flexible part of the bottom flashing section and fit bottom
flashing section. Note that the sides of the bottom flashing section
must be fitted under the side flashings.
Fit covers.
Shape infill pieces from the rest of the metal sheets and fit so that
all cuts are covered.
Fix infill pieces with rivets (seal holes with silicone if necessary).
VELUX 73
5
Special roofing materials
Metal sheets with pre-formed standing seam
Use flashing EDW for installation of VELUX roof windows in roofs
with pre-formed steel sheets that are clicked together.
Note! Flashing EDE can be used for pre-formed zinc or aluminium
metal sheets, see page 76.
Install the window as shown in the installation instructions for the
window. Follow normal procedure for connection of underfelt and
insulation.
Position the metal sheets below the bottom frame, not closer to
the frame than the bottom installation batten. The sheet must continue at least 200 mm past the frame at the sides to make space
for fitting the bottom flashing section (1).
Fit the bottom flashing section and shape the flexible part of it
around the ribs of the metal sheets. Bend the bottom flashing
section as shown in the installation instructions so that it presses
against the metal sheets (2).
Fit the flashing around the window and cut the foam gasket to a
height of approx 25 mm. Flatten the rib of the top flashing section
on both sides (3).
Position metal sheets around the window. The distances from the
metal sheets to top and side frames follow the standard instructions. Fix metal sheets around the window with screws with
tightening washers. Do not screw through the flashing (4).
1
2
3
4
74 VELUX
Special roofing materials
5
Decra roofing panels
Use flashing EDW for installation of VELUX roof windows in roofs
with Decra roofing panels.
The lowest level of these roofing panels is below the top face of
battens. This means that window and flashing must be installed
correspondingly deeper in the roof.
Establish a recessed area around the window for the flashing. This
area must be 25 mm below the top face of the battens. Ensure support of the battens as their load capacity is reduced.
Note! If it is not possible to keep a full roofing panel below the roof
window, please contact VELUX.
Y+
45
mm
X + 40-60 mm
80 mm
25 mm
140 mm
VELUX 75
5
Special roofing materials
Traditional standing seam roofs
Use flashing EDE for installation of VELUX roof windows in roofs
with traditional zinc or copper roofing sheets.
Install the window as shown in the installation instructions for the
flashing.
Observe position of the window and the distance to the nearest
seam. The width of the EDE flashing side sections is 240 mm. If
wider side sections are needed, order flashing EDE-Y with 630 mm
wide side sections.
240 mm
240 mm
a mm
20-30 mm
76 VELUX
20-30 mm
Special roofing materials
5
Slate
Use flashing EDL for installation of VELUX roof windows in slate
roofs.
A slate roof is tight because of the overlapping of the individual
slates. The required overlap depends on the roof pitch, local climatic conditions etc.
When flashing a roof window in a slate roof, the flashing parts
must be fitted in such a way that they "replace" the slates that
were removed when the window was installed.
Therefore, when determining the position of the window in the roof,
the EDL bottom flashing section must be considered, ie it must be
flush with the slates thus "replacing" the slates removed (A).
If this is not possible, required overlap must be established in a
different way, eg by fitting an extension piece under the bottom
flashing section (B).
A
B
The EDL flashing is designed for slates with a thickness of up to
8 mm (1). By adjusting the side soakers, the flashing can be installed in slates with a thickness of up to 20 mm (2).
Special installation instructions (EDL+) are available, please contact
VELUX Company Ltd.
1
2
VELUX 77
Special roofing materials
Thatched roofs
Use flashing EDW with flashing kit ZZZ 166 (pleated aluminium roll)
for installation of VELUX roof windows in thatched roofs.
180
mm
Build a frame from 45 x 95 mm members as shown. Position frame
on battens and fix to roof construction. Install window on this
frame.
Y
X
45
mm
X + 60 mm
approx
78 VELUX
Y+
5
100 mm
Special roofing materials
5
Thatched roofs
The drawing shows the principles for installation of a roof window in a roof construction with fire-retardant glass tissue.
The roof construction must always be adjusted to the specific
building, local architectural tradition and the directions of the
building material supplier.
ZZZ 166
Flashing EDW
Fire-retardant glass tissue
Roof window
Mineral wool
Frame insulation collar
Frame of members
(45 x 95 mm)
Batten
Rafter
Vapour barrier
Lathes
Plasterboard
VELUX 79
5
Special roofing materials
Grass roofs and the like
Use flashing EDL for installation of VELUX roof windows in grass
roofs and other types of roofing with a thick layer of natural
materials.
In these roof constructions a membrane under the natural material
ensures a tight seal around the installation. The membrane is led
from the roof surface to a built-up platform and up along the sides
of the frame all around the window.
Establish frame within the dimensions shown. The platform must
be level with the natural material. Chamfer the edges of the frame
to reduce the possibilities of the membrane cracking or splitting.
Establish transverse drainage above the frame.
If the membrane consists of two layers, position both layers before
fitting the flashing. Fit the flashing all around the window. Fold
down edges of flashing over the platform at the sides so that the
natural material can cover the edges of the flashing. Position a
humus resistant flashing component over the top flashing section.
Bend the flashing component so that it follows the upper side of
the frame. This flashing component is not supplied by VELUX.
80 VELUX
Special roofing materials
5
Grass roofs and the like
33
16
0m
0m
m
m
100 mm
VELUX 81
Replacement / Renovation
Replacement of roof window
84-87
Roof renovation
88
Spare parts 89
Replacement of insulating glass unit 90-91
Replacement of roof window in slated roof 92-93
VELUX 83
6
6
Replacement / Renovation
Replacement of roof window
A VELUX roof window is designed to last for many years. A minimal amount of maintenance ensures a fully functional window provided that the gaskets of the window and the foam gaskets of the
flashing, if any, are replaced as and when required (see page 89).
VELUX is continuously working to improve the products, and therefore it will at some point be an advantage to replace the window
instead of renovating the old one.
TO BE CONSIDERED BEFORE REPLACEMENT
VELUX can assist in finding a suitable solution for replacing old
windows – regardless of size and brand.
Advantages when replacing the old window with a new VELUX
roof window:
• improved U-value – and therefore better comfort
• possibility of choosing another window type – eg changing from a
centre-pivot to a top-hung window, from a timber to a polyurethane window or from manual to electrical or solar operation.
Solar operated windows are particulary adaptable for this replacement application as they require no connection to the mains
power supply, see page 117 for further details.
• more attractive design – better integration in the roof
• guarantee for tightness and insulation around the window when
using VELUX installation products together with the window
Since 1973 VELUX has produced windows with standard dimensions. It is therefore almost always possible to get a new window
with dimensions that match those of the old window.
VELUX roof windows produced later than October 1998 are
installed 27 mm deeper in the roof surface to ensure better heat
insulation. Therefore, in a replacement situation choose one of the
following options (see the examples on pages 86-87):
A Replacing lining
B Keeping lining but reduce their depth
C Keeping lining without alterations
D Replacing with one larger window or with more windows
84 VELUX
Replacement / Renovation
6
Replacement of roof window
VELUX 85
6
Replacement / Renovation
Replacement of roof window
A. REPLACING LINING
Install the roof window following standard procedure and with a
standard flashing.
VELUX installation products BDX, BFX and BBX should be used if
possible.
Note! When using VELUX linings while maintaining the old window
opening, the lining must be specially adjusted (see page 88).
a
B. K
EEPING LINING BUT REDUCING DEPTH
If the window to be replaced is from before October 1998, the new
window will be installed deeper in the roof than the old window.
This means that the lining must be reduced by 27 mm on all sides.
Position frame in the lining and secure with installation brackets.
Fit standard flashing following standard procedure. The lining fits
at the sides but it is necessary to fit facings (a) at top and bottom.
VELUX installation products BDX, BFX should be used if possible.
The frame insulation collar from installation set BDX may have to
be adjusted at the top or bottom.
86 VELUX
Replacement / Renovation
6
Replacement of roof window
C. KEEPING LINING WITHOUT ALTERATIONS
The replacement window will be installed above its normal installation height therefore a special flashing is required. For single
windows use flashing EL for slates or EW for tiles. Extension flashing ELX together with standard combi flashings are used when
replacing combined windows.
Position the frame on the lining and secure with brackets supplied
with the flashing. The complete installation is described in the
installation instructions supplied with the flashing.
VELUX underfelt collar BFX can be used, but not the frame insulation collar from installation set BDX.
D. REPLACING WITH ONE LARGER WINDOW OR MORE
WINDOWS
This is equivalent to a new installation. Therefore, it should be
considered whether the rafter spacing allows for a wider window.
If not, trimmers must be installed.
VELUX 87
Replacement / Renovation
Roof renovation
When changing from one roofing material to another, the position
of the new roof windows may have to be shifted slightly. Changed
batten spacing may require that the position of the window is
moved upwards/downwards to allow for correct installation and
relationship to the new roofing material.
To be able to maintain the interior opening without having to fill
any gap between lining and interior opening, adjust the angle of the
top or bottom element of the VELUX lining (screws lines 1 and 4
below refer to the template supplied with the lining).
A
10
m
x1
ma
The window can be lowered up to 110 mm.
Position the top element (A) in screw line
4. If the window is raised the lining cannot
cover the interior opening.
m
60° ROOF PITCH
B
ax
18
A
m
The window can be raised up to 180 mm.
Position the bottom element (B) in screw
line 1.
0
m
m
45° ROOF PITCH
B
m
18
0
B
ax
The window can be lowered up to 180 mm.
Position top element (B) in screw line 1.
m
45° ROOF PITCH
m
6
A
15° ROOF PITCH
The window can be raised up to 110 mm.
Position bottom element (A) in screw line 4.
The lining cannot cover the interior opening
if the window is recessed into the roof
opening, ie with flashing EDL.
88 VELUX
ma x
A
110
mm
B
Replacement / Renovation
6
Spare parts
VELUX products are designed to last for many years, even with a
minimal amount of maintenance. Wearing parts must, however, be
replaced at regular intervals. Consequently, VELUX offers a wide
range of spare parts that are available many years beyond the time
of purchase.
To make maintenance easy for you, VELUX offers various DIY
service kits (general maintenance, repair lacquer etc).
For more information visit www.velux.co.uk or www.velux.ie
where you will find information about how to order spare parts.
When ordering, state window type and size that appear from the
data plate of the window.
For further information, please contact VELUX Company Ltd.
Top cover
Upper cover
Sash profile
Lower cover
Bottom sash cover
over glass
Side frame cover
Bottom sash cover
under glass
Bottom frame cover
Striking plate for lock
casing
Filter rail
Barrel bolt
Lock casing
Data plate
Pivot hinge
Ventilation flap with
control bar and gasket
Bushing for barrel bolt
VELUX 89
6
Replacement / Renovation
Replacement of insulating glass unit
VELUX offers complete replacement kits, if replacement of the
insulating glass unit in a roof window is required.
A replacement kit includes all necessary components:
• New insulating glass unit (choice of units with different qualities)
• Sealant
• Complete set of instructions
The replacement kit is available from www.velux.co.uk or
www.velux.ie. Remember to state window type and size from the
data plate of the window.
The replacement kit is delivered in a cardboard packaging that can
also be used for disposal of the replaced insulating glass unit.
90 VELUX
Replacement / Renovation
6
Replacement of insulating glass unit
The procedure is simple:
1. Remove sash and place eg on trestles.
2. Unscrew covers and sash profile and lift out the old insulating
glass unit.
3. Place new insulating glass unit in sash.
4. Refit sash profile and covers and replace sash.
1
2
3
4
VELUX 91
6
Replacement / Renovation
Replacement of roof window in slated roof
Use flashing EDL when replacing an old window with a new one
in roofs with slates. In most cases, the installation instructions for
flashing EDL can be followed.
If it is either not desirable or not possible to remove the slates,
follow this procedure:
REMOVING THE OLD WINDOW
1. Remove the window sash and all window covers.
2. Saw the side frames and remove carefully.
3. C
arefully draw out side soakers and top and bottom flashing
sections. If the components are stuck in slate putty, loosen the
individual slate layers carefully from the flashing components
with a hand saw.
Remove putty from between the slate layers with the hand saw.
92 VELUX
Replacement / Renovation
6
Replacement of roof window in slated roof
POSITIONING THE NEW FLASHING
4. A
pply slate putty to the top flashing section and push it diagonally up between the slates.
5. A
pply slate putty to the side soakers and position between slate
layers. Follow the same procedure when fitting the bottom
flashing section.
POSITIONING THE NEW ROOF WINDOW
6. Fit four pieces of flat bar to the side frames.
7. F
it blocks on rafters to establish base for fixing of flat bars.
8. Lift frame into position from the inside and fix.
9. F
ollow standard procedures for fitting of exterior covers and
interior lining.
VELUX 93
Building physics
Roof construction 96
Roofing material 97
Underfelt98-100
Bearing construction Thermal insulation – U-value
Vapour barrier 101-102
103
104-105
Interior ceiling finish
106
Ventilation of habitable rooms 107
Sound insulation
108
Snow and ice around VELUX roof windows
109
VELUX 95
7
7
Building physics
Roof construction
A modern roof is a complicated construction consisting of many
different materials with many different functions.
1. Roofing material – primarily protects against water (rain and
snow), hail etc
2. U
nderfelt – protects against rain and snow and serves partly as
wind barrier
3. Bearing construction – rafters, battens
4. Heat insulation – minimises heat loss
5. Vapour barrier – prevents air and vapour penetration
6. Interior ceiling finish
When this construction is interrupted by the installation of a roof
window, there are off course demands to maintain the integrity of
the roof construction and the connections between the window
and the individual components within it.
1
2
4
3
5
6
96 VELUX
Building physics
7
Roofing material
The roofing material makes up the exterior weathershield that is
the primary protection against precipitation.
Roofing materials are available in a large number of types and
materials but regardless of this condensation will form on the underside of the roofing material and this moisture must be ventilated
to the outside. Therefore there must be a ventilation path under the
roofing material.
VELUX 97
7
Building physics
Underfelt
The underfelt protects the roof construction against harmful water
penetration, primarily from leakages in the roofing material. These
leakages mean that wind driven rain and snow may penetrate the
roofing material. Especially driving snow may cause problems if
there is no underfelt. Large amounts of snow may accumulate over
time and suddenly melt when the temperature rises.
Water that runs down the underfelt ends in the gutter. If the underfelt is interrupted by eg a roof window, the water must be drained
off to the sides of the window by installing a drainage gutter. The
drainage gutter drains off the water to the adjoining roof section
(between two trusses) where it can continue down the underfelt.
As a result of eg small leakages in the vapour barrier small amounts
of moisture may enter the roof construction from the inside of the
building. This moisture must be removed in order to avoid moisture
problems with subsequent rot and dry rot.
Depending on the means to removing the moisture, underfelts are
divided into ventilated and unventilated underfelts.
98 VELUX
Building physics
7
Underfelt
VENTILATED UNDERFELTS
Ventilated underfelts are made of diffusion tight materials. The
moisture is removed from the roof construction as the cavity
between insulation and underfelt is ventilated with fresh air.
The air circulation under a ventilated underfelt may be obstructed
in one or more roof sections when a window is installed. To ensure
ventilation in the roof section affected, it is recommended either:
• to fit ventilation pieces in the underfelt material (1) or
• to
establish ventilation holes at the top of the rafters (2), so that
air can flow to/from the adjoining roof section.
This must be done both above and below the window.
1
2
The lack of a ventilation path below the underfelt may result in
accumulation of moisture in rafters and insulation material. This
may reduce the performance of the insulating layer and cause rot
damages.
VELUX 99
7
Building physics
Underfelt
UNVENTILATED UNDERFELTS
Unventilated underfelts are based on diffusion open materials
that are positioned directly on the insulating material. The small
amounts of moisture that via diffusion through the vapour barrier
percolate through from the interior of the building to the roof construction continue through the underfelt material. From here the
moisture is removed by the ventilation under the roofing material.
As diffusion is not by far as effective as ventilation, it is very
important that the vapour barrier is absolutely airtight. The diffusion capacity of the underfelt is not sufficient to compensate for
leakages in the vapour barrier.
VELUX underfelt collar BFX is made of diffusion open material and
can thus be used for unventilated underfelts. The method for fitting
the underfelt collar is the same for ventilated and unventilated
underfelts.
100 VELUX
Building physics
7
Bearing construction
Sometimes the wish for a special VELUX solution requires adjustment of the roof construction in order to create sufficient space.
The need for such changes may have a deterrent effect on both
customers and installers, but often the problems are not so big if
the entire installation is thoroughly planned from the start.
Old roof constructions are often based on tradition and experience.
Changes to these roof constructions are therefore made on the
basis of traditional craftsmanship and experience with a fair share
of reason and caution.
In new roof constructions where the bearing elements are often
factory-made, the construction systems and materials have been
optimised on the basis of calculations. Any change/weakening of
the bearing system in these roof constructions may impair the construction beyond calculated permissible safety limits. Factory-made
rafters are most often marked with manufacturer identification
and it is recommended to seek advice from the manufacturer or a
structural engineer before making changes in such constructions.
The extra time and materials required to make a correct structural
change are relatively moderate considering that the roof construction is already accessible.
VELUX 101
7
Building physics
Bearing construction
VELUX roof windows are fixed with corner brackets with long
screws through the battens to the underlying rafter construction.
As the installation battens are not really bearing elements, there
are no specific requirements as to the strength of the battens.
102 VELUX
Building physics
7
Thermal insulation – U-value
Basically, thermal insulation of constructions is made to delay the
inevitable equalisation of the temperature between warm and cold
air and between warm and cold building components. This means
that somewhere in the construction there must be a layer of insulation material.
The heat conducting capacity of a material is called the lambdavalue (λ) and is measured in W/(mK). The lower the lambda-value
of a material the poorer the heat conducting capacity and thus the
better insulating capacity.
When different materials are combined in the same component, the
lambda-value of each material contributes with a certain share to
the total heat conducting capacity. This capacity of components
is called the U-value, or the thermal transmittance coefficient and
is measured in W/(m²K). Also in this case the insulating capacity is
better the lower the U-value.
In a VELUX roof window two components specifically have an
influence on the total U-value of the window.
The insulating glass unit accounts for the largest share of the
total thermal loss through the window. The insulating capacity of
the insulating glass unit has a great impact on the comfort in the
area close to the window as a poorly insulated insulating glass unit
will cool the air. The cold air will flow from the insulating glass unit
as a downdraught.
The frame and its connection to the roof construction cover a
smaller area. Appropriate insulation around the frame is, however,
essential as insufficient frame insulation results in lower surface
temperatures and thus a risk of condensation on the interior surfaces. The stated U-value of a VELUX roof window applies only if
the frame is insulated carefully up to the upper side of battens. The
required level of insulation can be achieved using the VELUX frame
insulation collar from installation set BDX 2000.
VELUX 103
7
Building physics
Vapour barrier
The vapour barrier is a membrane of a diffusion tight material
positioned on the warm side of the construction of the house. It
prevents vapour from the warm indoor air from reaching the colder
air/surfaces within the wall or roof construction.
If the warm air is not stopped the vapour will condensate on the
cold surfaces. In periods with frost this will result in accumulation
of ice.
In this way more moisture enters than escapes the construction
creating ideal conditions for damaging rot and dry rot.
In addition to reducing the strength and life time of the building
construction dry rot may also result in an unhealthy indoor climate.
This makes the vapour barrier one of the most important components in the construction of the building!
Therefore it is very important to the performance and life time of
the construction that the vapour barrier is fitted correctly ensuring absolute air tightness. Especially observe that details such as
joints, penetrations and connections to other components of the
construction are airtight.
104 VELUX
Building physics
7
Vapour barrier
When a VELUX roof window is installed any vapour barrier present
is penetrated. It must be re-established with a membrane that
connects the window to the vapour barrier within the roof/wall
construction.
VELUX vapour barrier collar BBX is the easiest solution.
If the membrane used is not a VELUX vapour barrier collar BBX,
this membrane must be connected to the window rebate at the
frame with butyl or acrylic joint filler to ensure tightness. Where
the window aperture meets the interior ceiling the membrane must
be connected to the vapour barrier of the house by means of tape
or tight overlapping joint.
VELUX 105
7
Building physics
Interior ceiling finish
To complete the hole in the roof construction on the interior side a
lining must be established.
The lining is of great importance to the performance and to the
overall impression of the window.
• The top should be horizontal and the bottom vertical so that
warm air from a heat source below the window can keep the inner
glass pane heated and prevent the possibility of condensation occurring. This shape also allows more light into the room.
• Top and bottom positioned at right angles to the window would
on the other hand make the window seem smaller and even impair
the view. It may also allow for cold areas at the bottom of the
window allowing condensation to occur.
• Note that the colour of the lining has an influence on the amount
of light reflected from the lining into the room.
VELUX linings are, of course, designed to meet these requirements. In addition VELUX linings offer further advantages that
cannot be obtained with a made-on-site lining.
• The curved top and bottom lining elements allow for more insulation (a).
• VELUX linings are fitted directly in the window rebate. It is not
necessary to provide additional framing for the lining.
• VELUX linings are factory finished and further treatment is not
required.
a
106 VELUX
Building physics
7
Ventilation of habitable rooms
One person secretes approx 3 l of water vapour a day via the exhalation air. Additionally, in a standard one-family house
15 l of water vapour a day are generated from bathing and cooking.
This will result in an increase in the level of humidity if the indoor
air is not renewed.
A high level of humidity creates mould and mould fungus that can
cause both health problems and damage to building components.
Therefore, to comply with building regulations, a minimum of air
renewal must be provided in dwellings to maintain a good indoor
climate and reduce the effects of moisture on the construction of
the house.
Of course, the amount of smell and moisture effect differs from
dwelling to dwelling. In addition to the building regulation requirements by observing the following general guidelines it will in most
cases be possible to maintain a low level of humidity.
• It
is recommended to air habitable rooms 3-4 times a day, each
time for 5-7 minutes.
• Rooms
with a high level of humidity such as kitchens and bathrooms must be aired with mechanical air extraction.
• Heating should not be turned off during airing as the cold outdoor
air should be heated immediately after the windows have been
closed again.
• Rooms should not remain unheated for long periods of time as
this results in an elevated level of humidity. If the bedroom is kept
cold at night, it should be re-heated during the day.
• Avoid drying laundry indoors.
When airing briefly,
walls and furniture
do not get cooled and
consequently the heat
loss is minimal.
VELUX 107
Building physics
Sound insulation
In buildings sound spreads from room to room and from the outside
to the inside in two different ways; partly as airborne sound where
air pressure waves spread through crevices in the constructions
and partly as structural sound that is transmitted via vibrations in
solid materials.
The airborne sound can be reduced by carefully sealing crevices in
the construction. Structural sound can be diminished by separating
the constructions or by using high density building materials.
If there are special demands to sound insulation when installing a
VELUX roof window, roof window GGL in the special sound insulating variant --62 can be used. The construction of this variant has
been optimised with regards to sound insulation and the insulating
glass unit has an additional 8 mm layer of glass.
In addition to this, the installation must be carried out so that the
connection between the window and the roof construction ensures
effective sound insulation.
This may be ensured by:
• fitting infill battens along the window frame (a),
• fitting strips of heavy bituminous roofing felt under the underfelt
collar (b) and
• sealing connections through which airborne sound may pass (c).
X + 20 cm
25 cm
c
20
X
a
Y+2
0 cm
cm
Y
Y+
7
25 cm
X+2
25 cm
0 cm
25 cm
108 VELUX
b
c
Building physics
7
Snow and ice around VELUX roof windows
In prolonged cold periods with heavy snowfall considerable
amounts of snow may accumulate on the roof and a VELUX roof
window could become covered.
When the temperature rises the window will often be the first
place where the snow starts melting because of the small extra
heat loss on and around the window. Melt water will run down the
window and freeze once it reaches the colder, better insulated roof
surface below the window.
In such cases a bank of ice can form below the window damming
newly melted water and thus causing water ingress around the
window. Neither the window nor the roof surface is designed to
resist this.
To avoid such problems, make sure that water can always
drain off from the bottom section and along the sides of the
window.
Banks of snow and ice should therefore be removed from the area
around the window in the same way as leaves and other debris
should be removed from flashing and gutters to allow rainwater to
flow freely.
Note! When installing windows in areas with severe weather conditions, extra measures should be taken:
• Always
include underfelt and ensure a tight connection to the
window. Roofing materials are not designed to resist dammed up
water.
•A
void thermal bridges by insulating carefully around the window.
• Pay
extra attention to the vapour barrier to avoid moisture
penetration around the window.
VELUX 109
Product information
Product types VELUX product and order codes
112
113-114
VELUX roof windows
115
Centre-pivot roof windows 116
Top-hung roof windows
117
Roof Balcony 118
Roof Terrace 119
Smoke Ventilation System
120
Additional elements 122
Vertical window elements 123
Flashings124-127
Installation products
128-129
Linings130-131
Electrical operation 132-133
Blinds, awnings and shutters
134-135
Insulating glass units
136-137
VELUX 111
8
8
Product information
Product types
The VELUX roof window is the key product in the VELUX product
programme.
But in addition to this, VELUX offers a wide range of different product types that together ensure correct installation and optimum
functionality of the roof window in all situations.
This chapter describes the various product types.
Flashing
Roller shutter
Roof window
Underfelt collar
Sunscreening
Lining
Frame insulation Vapour barrier collar
collar
In order to comply with customer demands in the best possible way
the VELUX products are available in many different standard sizes
and variants.
To be able to handle and describe this product system in a simple
way, VELUX uses product codes with ten characters divided into
three 'blocks'.
Examples Type designation
GGL
EDW
Size code
M08
M08
Variant code
3059
2000
112 VELUX
Product information
8
VELUX product and order codes
TYPE DESIGNATION
The first three characters in the product code of any VELUX product is the type designation.
The first letter in the type designation indicates the product family.
Here are some examples:
G-- indicates a roof window, eg GGL
E-- indicates a flashing, eg EDW
B-- indicates an installation product, eg BDX
L-- indicates a lining, eg LSB
S-- indicates a roller shutter, eg SML
SIZE CODE
The second block consisting of one letter and two digits indicates
the size of the product. The size code of the window indicates the
exterior frame dimensions.
Eg C
04 = 550 x 980 mm (w x h)
M08 = 780 x 1400 mm (w x h)
The code refers to the position in the VELUX size chart
(see page 151).
The size code of other products indicates which window the product matches.
Note! All sizes are not marketed but can be obtained to order.
VARIANT code
Most products are available in various materials and with various
surfaces. Window covers and flashings that are as standard made
of aluminium are also available in copper and zinc. Insulating glass
units are available with special qualities etc.
The four digits in the variant code define the different types of
materials and surfaces.
Note! Possible variants appear within the various sales brochures.
VELUX 113
8
Product information
VELUX product and order codes
DATA PLATE
All VELUX roof windows are equipped with a data plate with precise information about the window. On roof windows with control
bar the data plate is placed on the top right hand side of the sash
behind the ventilation flap.
When ordering eg an insulating glass unit, spare parts or accessories, state code from the data plate. This ensures delivery of the
correct product when ordering.
1
Type designation
2 Size code
3 Variant code
4 Production code
1
2
3
1
114 VELUX
4
2
4
Product information
8
VELUX roof windows
VELUX roof windows are available as centre-pivot windows with
the type designations GGL and GGU and as top-hung windows with
the type designations GHL, GHU, GPL and GPU.
Windows with a type designation ending in --L, eg GGL, are traditional timber windows. Windows with a type designation ending in
--U, eg GGU, are polyurethane windows with a timber core. Polyurethane windows are especially suited for rooms with a high level
of humidity or when low maintenance products are required.
The range of VELUX roof windows also includes the CABRIO® Roof
Balcony, the Roof Terrace and windows with special characteristics
and application areas, eg Conservation Roof Window, Flat Roof
Window and Smoke Ventilation System.
Roof Balcony
Roof Terrace
Conservation
Roof Window
All VELUX roof windows can be installed individually as well as
in combinations side by side and/or over/under each other (see
chapter 3).
VELUX 115
8
Product information
Centre-pivot roof windows
GGL – timber window
GGU – white polyurethane window
Characteristics:
• Can be installed in roof pitches from 15° to 90°
• Can be opened/closed with the control bar at the top
• Features ventilation flap with air filter
GGL INTEGRA® – timber window
GGU INTEGRA® – white polyurethane window
Characteristics:
• Electrical variants of GGL/GGU delivered with integral motor and
control
• Operated with wireless remote control based on
io-homecontrol® technology (see page 132). Can also be operated
manually
• Delivered with rain sensor that ensures automatic closing of the
window in case of rain
• Prepared for subsequent fitting of electrically operated sunscreening products
Apart from the above, the windows have the same characteristics
as GGL/GGU.
116 VELUX
Product information
8
Centre-pivot roof windows
GGL Solar – timber window
GGU Solar – white finish polyurethane window
Characteristics:
• Solar driven variants of GGL/GGU delivered with integral motor
and control
• Wireless installation
• Operated with wireless remote control based on io-homecontrol®
technology (see page 132). Can also be operated manually
• Delivered with rain sensor that ensures automatic closing of the
window in case of rain
• Can be combined with a broad range of solar driven sunscreening
products
Apart from the above, the windows have the same characteristics
as GGL/GGU.
VELUX 117
8
Product information
Top-hung roof windows
GPL – timber window
GPU – white polyurethane window
Characteristics:
• Can be installed in roof pitches from 15° to 55°
(with special springs up to 75°)
• Can be opened closed/closed with a handle at the bottom
• Features ventilation flap with air filter
• Can stay open in all positions up to 45°
• Can be used for emergency escape, see page 9
GHL – timber window
GHU – white polyurethane window
Characteristics:
• Can be installed in roof pitches from 15° to 55°
(with special springs up to 75°)
• Can be opened and closed with a handle at the bottom
• Features ventilation flap with air filter
• Can be maintained in three fixed opening positions up to 30°
• Can be used for emergency escape, see page 9
118 VELUX
Product information
8
Roof Balcony
GDL - Cabrio® Roof Balcony
Characteristics:
• Can be installed in roof pitches from 35° to 53°
•T
he top-hung upper section is opened/closed with a handle at
the bottom
•T
he upper section can stay open in all positions up to 45°
• The upper section features ventilation flap with air filter
•T
he bottom-hung lower section is opened/closed with two
handles on the top sash
•T
he bottom section has integral banisters that automatically
slide into position
• Is delivered complete with flashing
• Only available in timber version
•C
an be installed in combination with roof windows GPL and GIL
VELUX 119
8
Product information
Roof Terrace
GEL – upper section: a modified top-hung roof window
VEA – lower section: hinged on the left hand side,
outward opening sash
VEB – lower section: hinged on the right hand side, outward
opening sash
VEC – lower section: fixed (not opening) sash
The VELUX Roof Terrace is a combination of upper and lower sections which when opened allow access to a roof terrace. Because of
structural considerations a roof terrace can contain only one VEA/
VEB opening lower section.
The terrace floor and railing are not supplied by VELUX.
Characteristics:
• Can be installed in roof pitches from 35° to 53°
• The upper section is opened/closed with a handle at the bottom
• The upper section can stay open in all positions up to 45°
• The upper section features ventilation flap with air filter
• Lower sections VEA/VEB are opened/closed with a handle on the
side sash
• When both upper and lower sections are open, there is free access
to the roof terrace
• Is delivered complete with flashing and adjustable support rafter
EBY W10 3100
• Only available in timber version
120 VELUX
Product information
8
Smoke Ventilation System
GGL/GGU ----40 – Smoke Ventilation System
Characteristics:
•C
an be installed and used for venting of smoke in roof pitches
15°-90°
•O
ptimised geometric and aerodynamic venting area
•S
ystem comprises centre-pivot roof window GGL with preinstalled motor with flashing or kerb for flat roof installation,
control unit, break glass point and smoke detector
•T
he control unit can control up to 2 smoke ventilation windows
•C
ertified according to EN 12101-2
VELUX 121
8
Product information
Additional elements
GIR - arched
GID - triangular
GIV - rectangular
Characteristics:
• Upper element with fixed sash
• Can be installed in roof pitches from 20° to 85°
• Can only be installed above a VELUX roof window
• Is installed frame-to-frame with the roof window below
• Only available in timber version
GIL - timber window
GIU - white polyurethane window
Characteristics:
• Rectangular lower element with fixed sash
• Can be installed in roof pitches from 15° to 90°
• Can only be installed below a VELUX roof window
• Is installed frame-to-frame with the roof window above
122 VELUX
Product information
8
Vertical window elements
VFE - timber window with bottom-hung, inward opening sash
The window is opened/closed with a handle on the top sash.
VFA – timber window, tilt and turn – hinged on the left hand side,
inward opening sash.
VFB – timber window, tilt and turn – hinged on the right hand
side, inward opening sash.
The windows are opened/closed with a handle on the side sash.
The vertical window elements VFE/VFA/VFB are installed vertically below a VELUX roof window installed in a roof pitch between
15° and 55°.
VELUX 123
8
Product information
Flashings
VELUX flashing system ensures a watertight connection between
the roof window and the roofing material.
Like the roofing material, the flashings drain
off water resulting
from normal weather
conditions. The flashings are not 'submarine
tight' and therefore
it must be ensured
that water cannot
accumulate around
the window. To avoid
this happening it is
important to observe
the relationships
between the window,
flashing and roofing
material as indicated
within the installation
instructions.
THE FLASHING SYSTEM
The wide range of different types of VELUX flashings ensures that
tested standard solutions are available for most roofing materials
and installation situations.
124 VELUX
Product information
8
Flashings
The type designation for flashings consists of three letters.
The first letter in the type designation is always an E, eg EDW.
The second letter refers to the installation situation, eg EDW.
ED-
EB-
EK-
Single flashing
Twin flashing
Combi flashing
EF-
EE-
EA-
Flashing for combined
roof/vertical window
elements
Flashing for roof
terrace
Kerb flashing
ETFlashing for additional
elements
ECX-TF
ZZZ 166
Insulated wooden kerb
for installation in flat
roofs
Flashing kit (4 mm
pleated aluminium roll)
VELUX 125
8
Product information
Flashings
The third letter in the type designation indicates the types of
roofing material in which the flashing can be installed. In case of
profiled roofing materials, the profile height determines the choice
of flashing, eg EDZ.
Below is an overview of the most commonly used flashings:
E-W
E-Z
For flat and profiled
roofing materials
with profile height
up to 45 mm.
Roof pitch from
20° to 90°
For flat and profiled
roofing materials with
profile height up to
120 mm.
Roof pitch from
15° to 90°
E-L
E-E
E-P
For flat roofing materials with a thickness up
to 8 mm.
Roof pitch from
15° to 90°
For installation in
traditional standing
seam roofs
For plain tiles with a
maximum thickness of
15 mm.
Roof pitch from 25°
to 90°
Profile height
Installation in roofs with special roofing materials as eg thatched or
grass roofs, see chapter 5 or contact VELUX Compagny Ltd.
As standard, VELUX flashings are made of grey, lacquered aluminium but they are also available in other colours or materials such as
copper and zinc.
126 VELUX
Product information
8
Flashings
E-J
E-N
For profiled roofing
materials with profile
height up to 90mm.
Roof pitch from 20°
to 90°.
The window is installed
40 mm deeper in the
roof surface
As E-L, but the window
is installed 50 mm
deeper in the roof
surface.
Roof pitch from
35° to 90°
Recessed installation in profiled roofing materials with flashing EDJ
Recessed installation in flat roofing materials with flashing EDN
VELUX 127
8
Product information
Installation products
VELUX installation products ensure connection to the underlying
layers that are typically included in a roof construction, ie underfelt,
insulation and vapour barrier (see chapter 7).
BDX 2000
Installation set consisting of frame insulation collar BDX and underfelt collar BFX with drainage gutter.
BFX
BDX
BDX
The frame insulation collar consists of
shaped polyethylene insulation in a stable
steel frame. The collar is positioned in the
hole in the roof before the VELUX window
is installed. This ensures an effective insulation around the frame.
BFX
Underfelt collar of diffusion open material
with pleated sides that are shaped around
the battens to ensure a rain and snow-tight
connection. Can also be supplied separately.
128 VELUX
Product information
8
Installation products
BBX
Polyethylene vapour barrier collar fitted in
the window rebate and led to the interior
ceiling/wall where it is connected to the
vapour barrier of the roof/wall with tape
supplied.
EBY/EKY
Support rafter of laminated wood provides
support and interior finish between windows installed side by side with a frame
distance of 18 mm (EBY) or 100 mm (EKY).
EBY/EKY are available in two finishes,
white foil for white finish polyurethane windows and clear lacquer for timber windows,
and three lengths, 2000 mm, 2700 mm and
3500 mm.
EBY W10
Adjustable support rafter of laminated
wood.
EBY W10 is used for installation of combinations of roof/vertical window elements or
for Roof Terrace System.
EBY W10 is available in two finishes, white
foil for white polyurethane windows and
clear lacquer for timber windows.
LGI
Frame extension of laminated wood (with a
finish of clear lacquer or white paint). Fitted
from the inside once the window has been
installed.
If the installation does not include a VELUX
lining, the frame extension can also be used
to ensure sufficient space for insulation in
the roof void above and below the window.
LGI
BBX
VELUX 129
8
Product information
Linings
VELUX linings ensure an easy and quick connection of the window
to the interior ceiling finish. The white, semi gloss surface and the
white facings supplied ensure a harmonious connection from the
window to most walls.
LSB/LSC/LSD
Standard linings to be used in roofs with a
thickness of 125 mm to 500 mm and in roof
pitches from 15° to 90°.
In roof pitches from 30° to 60° it is possible
to install lining with horizontal top and
vertical bottom. The linings are fitted and
secured in the window rebate.
LEI
Vertical wall element to be fitted together
with linings LSB/LSC/LSD in roof pitches
from 30° to 60°.
The supplementary kit consists of additional side sections and a window sill for
installation in vertical wall. The sill depth is
max 500 mm (see page 59).
LFI
Window sill to be fitted in linings
LSB/LSC/LSD.
The sill is fixed to the bottom lining section.
The sill depth is 270 mm.
130 VELUX
Product information
8
Linings
LVI
Supplementary lining to be fitted with
linings LSB/LSC/LSD in roof pitches from
30° to 55°.
The supplementary kit is used for combinations with a roof window above a vertical
window element.
The supplementary kit consists of extra
side sections and a window sill. The sill
depth is max 300 mm.
LLB/LLC/LLD
Additional side sections to be fitted with
linings LSB/LSC/LSD.
The supplementary kit is used for combinations of a roof window with an additional element GIL/GIU or GIV as well as for
CABRIO® Roof Balcony System.
Special products
Linings are also available for twin installations with 18 mm frame distance.
These linings must be ordered as special
products.
KRA 100
Frame lights KRA 100 are spotlights to be
fitted in VELUX or on-site linings. To be
used only in conjunction with roof windows
GGL INTEGRA®/GGU INTEGRA® and not
with GGL Solar/GGU Solar.
VELUX 131
8
Product information
Electrical operation
Electrical operation of VELUX roof windows, sunscreening products and frame
lights gives maximum comfort when operating products within and out of reach.
As the products are based on radio frequency (RF) technology, they can be operated from anywhere in the building with the
same remote control. They can be operated
individually and as a group.
You can choose an all-in-one electrically
operated roof window
GGL INTEGRA®/GGU INTEGRA® or a solar
powered roof window GGL Solar/GGU Solar,
see pages 116-117.
Alternatively, a manually operated roof
window can, at the time of installation, be
prepared for later upgrading to electrical
operation, see page 24.
UPGRADING TO ELECTRICAL OPERATION
A manually operated centre-pivot window GGL/GGU can be
upgraded to electrical function similar to an electrically operated window GGL INTEGRA®/GGU INTEGRA® by fitting electrical
conversion kit KMX 100. The kit includes all parts necessary for
electrical operation including remote control. The window operator
is fitted into the window and connected with cable to the power
supply.
Manually operated top-hung roof windows GPL/GPU/GHL/GHU
can be upgraded to electrical function using electrical conversion
kit KMX 200.
An alternative solution is to choose solar conversion kit KSX 100.
The kit includes all parts necessary for electrical operation including remote control but does not require connection to the mains
supply. Instead the solar cell supplies the window operator with
power. Sunscreening products must be from the VELUX solar collection, eg VELUX solar roller shutter SSL.
io-homecontrol® provides advanced and secure radio technology that is easy to install.
io-homecontrol® labelled products communicate with each other, improving comfort,
security and energy savings.
www.io-homecontrol.com
132 VELUX
Product information
8
Electrical operation
KMX 100
KMX 200
KSX 100
VELUX 133
8
Product information
Blinds, awnings and shutters
VELUX roof windows are prepared for fitting of original VELUX
blinds and external awnings or shutters. The products are designed
so that fitting is both easy and quick and they are available in
manual, electrical or solar powered versions (pleated and Venetian
blinds are not available in solar versions).
For further product information, visit www.velux.co.uk or
www.velux.ie where the VELUX blinds collection brochure may be
ordered or downloaded.
PLEATED BLINDS
Provide privacy and a soft light in the room.
VENETIAN BLINDS
Control the amount and direction of light
entering the room and protect against heat.
ROLLER BLINDS
Provide privacy and a soft light in the room.
Blackout BLINDS
Provide complete blackout and reduce both
influx and radiation of heat.
134 VELUX
Product information
8
Blinds, awnings and shutters
INSECT ROLLER SCREEN
Keeps out insects but allows ventilation
(not available in electrical or solar versions).
AWNING BLINDS
Prevent direct sunlight from reaching the
insulating glass unit keeping rooms cool
while at the same time allowing a view to
the outside.
ROLLER SHUTTERS
Provide additional security, and effective
daylight, heat and noise reduction from the
outside plus additional thermal insulation.
VELUX 135
8
Product information
Insulating glass units
The two last figures in the variant code indicate which type of insulating glass unit that
is fitted in the window (eg GGL M08 3059).
VELUX offers different types of insulating
glass units for different purposes. The most
commonly used insulating glass units are
described below.
If other types of insulating glass units are
required, please contact VELUX Company
Ltd.
16 MM REPLACEMENT GLAZING (--59C)
16 mm insulating glass unit to be used to
obtain a better insulating value when replacing the pane in old windows.
STANDARD ENERGY GLAZING (--59)
As standard, VELUX roof windows are supplied with a 24 mm low energy insulating
glass unit with heat insulating coating and
gas filled cavity. This unit comes with a
toughened outer pane.
ENERGY GLAZING WITH FUNCTIONS
(--73)
In addition to the features described for
standard low energy glazing above (--59),
this insulating glass unit comes with an
inner pane of laminated glass for enhanced
personal safety, UV protection against
premature fading of furniture, better sound
reduction and an outer coating which helps
the window stay cleaner for longer.
OBSCURE GLAZING (--34)
In addition to the features described for
standard low energy glazing above (--59)
this insulating glass unit comes with an inner pane of 4 mm obscure glass. This makes
it ideal for bathrooms as it provides privacy
without reducing the amount of natural
light.
136 VELUX
--59C
--59
--73
--34
Product information
8
Insulating glass units
ENERGY AND NOISE REDUCTION
GLAZING (--60)
This glass unit combines all of the characteristics of the --73 variant but with an
improved thermal performance and thicker
toughened outer pane to reduce external
noise level.
LOW ENERGY GLAZING (--65)
This glazing is recommended for new buildings with extra demands for heat insulation.
This 33 mm gas filled low energy glass unit
is triple glazed with two insulating coatings.
In addition to the extra heat insulation this
insulating glass unit has the same features
as energy glazing with functions (--73).
--60
--65
HANDLING AND CLEANING PANES
Avoid any contact from silicone or sharp and abrasive objects with
the outer pane. Never attempt to clean off dirt on the pane without
first applying water. If any works are taking place in the vicinity
of the pane, protect the pane with a clean plastic sheet to prevent
any splashes or staining from aggressive and abrasive compounds.
Clean water will normally be sufficient for cleaning the pane. Ordinary, non-abrasive household cleaners can also be used.
LAMINATED GLASS
Insulating glass units with laminated glass on the inside are recommended for roof windows installed at high level above areas where
people sleep, play or work. Laminated glass consists of two or more
layers of glass with a plastic foil (PVB) in between. In case of breakage, the lamination holds fragments together. Insulating glass units
--73, --60 and --65 have laminated inner glass.
CLEAR AND CLEAN COATING
Activated by the UV rays of the sun, an invisible coating on the
outside of the exterior glass of the window breaks down and
loosens organic dirt that is then simply washed away by the rain
therefore reducing the need to clean the window. Glazing with the
clear and clean coating is recommended for roof windows installed
out of reach.
The actual position of the window in combination with the weather
may influence the effect. Insulating glass units --73, --60 and --65
have the clear and clean coating.
VELUX 137
Other products
9
Sun tunnel
140-141
Flat roof window
142-143
Solar hot water system
144-145
VELUX 139
9
Other products
Sun tunnel
VELUX sun tunnels are complete installation kits delivered with all necessary
components for both exterior and interior
connections. An installation kit consists of
three modules:
• Exterior rooflight module
• Tunnel (flexible or rigid)
• Interior light diffuser unit
The sun tunnel directs the natural light
into areas of the house where installation of traditional VELUX roof windows is
either not possible or not appropriate. It is
recommended for corridors, storage rooms,
toilets etc.
The sun tunnel is available in two sizes, 010
(Ø 250 mm/10”) and 014 (Ø 350 mm/14”).
Installation of a sun tunnel requires access
to the attic. This does not apply to TCF that
is designed for flat roofs with a roof thickness between 200 and 900 mm.
Rooflight module
The choice of rooflight module depends on
roof pitch and roofing material:
- TCF for flat roofs, roof pitch 0°-15°. Made
of environmentally friendly PVC, with polycarbonate dome
- TLF/TLR for flat roofing materials such as
slates, roof pitch 15°-60°. 4 mm toughened
glass pane with clear and clean coating
and integral flashing made of lacquered
aluminium
- TWF/TWR for profiled roofing materials, roof pitch 15°-60°. 4 mm toughened
glass pane with clear and clean coating and
integral flashing made of polyurethane
140 VELUX
Other products
9
Sun tunnel
Tunnel
The tunnel is available in two types:
• a flexible fibreglass tunnel with a highly
reflective surface (in TCF, TLF and TWF).
Maximum supplied length:
TCF = 1000 mm,
TLF/TWF = 2000 mm
• a rigid aluminium tunnel with a highly
reflective coating (in TLR and TWR).
Supplied length: 1085 mm
The rigid tunnel can be extended with extension section ZTR in lengths of 600 mm
or 1200 mm.
Note! To prevent condensation problems,
the vapour barrier must always be connected to the light diffuser unit.
Light diffuser unit
Seen from the inside, the sun tunnel ends in
a frosted light diffuser discretely framed by
a white ceiling ring.
Various accessories available, such as:
• c eiling trim rings ZTB in various colours
• light kit ZTL
• ventilation outlet ZTW for TWF/TWR
VELUX 141
9
Other products
Flat roof window
VELUX flat roof windows CVP/CFP have
been specifically designed for installations
into flat roofs (0°-15°).
When ordering, please note that a flat roof
window consists of a window and a dome
which are ordered under one code but
delivered as two separate items.
The window consists of a combined frame/
sash made of white PVC fitted with an
energy insulating glass unit --73 with
toughened outer pane and laminated inner
pane for safety. The window is flashed with
the same material as the roof covering. The
window is available in two types:
-C
VP with opening sash and electrical
remote control INTEGRA®
- CFP with fixed (not opening) sash
The polycarbonate dome is fitted on top of
the window for additional protection, rain
noise reduction and rain water drainage.
The dome is available in two variants:
- clear
- opaque
142 VELUX
Other products
9
Flat roof window
VELUX flat roof window is available in several sizes and can be
used for replacement of existing dome lights.
HH
W mm
W
W
H mm
060060
600-610
600-610
080080
800-810
800-810
900-910
600-610
900-910
900-910
100100
1000-1010
1000-1010
120120
1200-1210
1200-1210
150 mm
060090
090090
90 mm
W/H
Installation hints:
-T
he design of the frame makes triangular lists unnecessary.
-A
void direct contact between open burner flame and kerb!
- If the installation requires mechanical fixing of the roofing felt to
the window frame, VELUX securing kit ZZZ 210 can be used.
VELUX 143
9
Other products
Solar hot water system
VELUX can deliver complete solar hot
water systems that contain all necessary
components for a complete installation.
Solar collector CLI
- is available in various sizes and can be
installed with VELUX roof windows using
the same flashings.
- can be installed in roof pitches from 15°
to 90°.
- is easy to install as solar collector CLI is
fitted directly on the roof battens.
- is connected using stainless steel, insulated flex tubes ZFR and ZFM that can be
hidden in the roof construction.
ZFR
ZFM
Principle for installation in the roof
Before closing the roof construction, it is
important that the temperature sensor is
fitted in the upper left corner of the last
solar collector in the flow direction, and
that the sensor cable is led to the hot water
tank.
Note! The temperature sensor is delivered
with the hot water tank.
Wherever flex tubes penetrate underfelt or
vapour barrier, ensure tightness by using
collars ZFT.
144 VELUX
Other products
9
Solar hot water system
Solar hot water tank TFF
Solar hot water tank TFF is delivered complete with all necessary components for the
solar hot water system.
•H
ot water tank for vented or unvented
installations
•P
ump group with controller
•E
xpansion tank(s) with connection tube
and holder
• Micro bubble air separator
• Temperature and pressure valves
• Glycol
TFF is compatible with all supplementary
heating units such as immersion heaters
and gas/oil boilers.
AIR BLEEDING
VELUX solar hot water systems do not
require an air bleeding valve to be fitted at
the highest point of the installation. Instead,
the micro bubble air separator included is
fitted on the hot flow from the solar collectors.
Filling the system
The system must be filled and correct pressure ensured with a filling pump with high
flow volume and pressure, eg VELUX filling
pump ZZZ 197. For further information
please contact the VELUX Company Ltd.
VELUX 145
Contact VELUX
Addresses / Service
VELUX Company Ltd sells and markets VELUX products on the
British and Irish markets.
Offices and showrooms are situated at the addresses below:
VELUX Company Ltd
Woodside Way
Glenrothes
Fife
Scotland
KY7 4ND
VELUX Company Ltd
Wellingborough Road
Kettering Parkway
Kettering
Northants
NN15 6XR
VELUX Company Ltd
Unit 1, Willsborough Cluster
Willsborough Industrial Estate
Clonshaugh
Dublin 17
Ireland
Contact VELUX
Addresses / Service
Technical Support
Telephone:
01592 778 225 (UK)
01 848 8775 (ROI)
Fax:
0870 380 9395 (UK)
01 848 8787 (ROI)
E-mail:
technical@velux.co.uk
technical@velux.ie
Service Support
Telephone:
01592 778 225 (UK)
01 848 8775 (ROI)
Fax:
0870 401 7961 (UK)
01 848 8557 (ROI)
E-mail:
service@velux.co.uk
service@velux.ie
Training Centres
Situated in Glenrothes, Kettering and Dublin
Telephone:
01592 776 980 (UK)
01 816 1617 (ROI)
Fax:
01536 510 411 (UK)
01 848 8753 (ROI)
E-mail:
training@velux.co.uk
training@velux.ie
List of telephone numbers
Technical Support (UK)
01592 778 225
Technical Support (ROI)
01 848 8775
Service Support (UK)
01592 778 225
Service Support (ROI)
01 848 8775
148 VELUX
Notes
VELUX 149
Notes
150 VELUX
Size chart
550
GDL
425
P25
[Glass P10]
GGL
9
101
601
S01
C01
[Glass P04]
419
102
P19
C02
118
1178
M04
5
206
14
306
F06
1398
2
308
1600
S06
GGU GGL
GPU GPL
ghl
P08
GpU GGL
GGU GPL
13
310
M35
78
Sun Tunnels
810
s10
u10
180
1800
46
11
312
TWr tWf
Tlr tlf
Sloped Fixed Additional Elements
334
GIU GIL
434
M34
GIU GIL
634
P34
834
S34
37
92
GIU GIL
920
GIL
U34
VFE
VFA
VFB
1/2-95
334
VFE
VFA
VFB
VFA
VFB
VFA
VFB
P31
1154
115
137
1374
4/10-95
634
S34
7/8-95
834
436
S36
60
tCf
VFA
VFB
438
014
14”
638
P38
S38
780
78
940
94
1140
114
1340
134
Solar Collectors
cli
118
060060
CFP
Cvp
1178
600
60
80
636
P36
CFP
Cvp
800
010
10”
Flat Roof Sun Tunnel
U34
4000
S06
cli
CFP
Cvp
060090
090090
140
CFP
Cvp
4000
m08
CFP
Cvp
4000
s08
180
cli
100100
1800
1000
cli
1398
080080
90
U31
VFA
VFB
VFA
VFB
338
TWr tLR
7/8-60
831
Flat Roof Windows
900
VFE
M38
660
66
VFE
S31
3-95
434
M36
4/10-60
631
VFE
VFA
VFB
P34
1/2-115
336
VFA
VFB
VFE
3-60
431
60
60
600
VFE
M31
954
95
VFE
1/2-60
331
M34
100
014
14”
37
Vertical Elements
cm
46
M12
550
55
335
U08
gGL
mm
VEA
VEB
VEC
GPU GGL
610
P10
M08
GGU
GPU
8
808
S08
GpU GGL
GgU GPL
3
410
M10
308
GGU GGL
GPU GpL
10
608
408
M08
GGL
GPL
GEL
GGU
GPU
ghu
4
606
P06
GGU GGL
GPU GPL
ghu
Roof Terrace
U04
GGU GGL
GPU GPL
ghl
406
M06
94
7
804
P04
GGU GGL
GPU GPL
ghu
GGL GGU GGL
GPU GPL
ghl
f08
160
31
404
ggu
35
204
F04
GGL GGU GGL GGU GGL
GPU ghl GPU GPL
ghu ghl
C06
140
1
304
GGL
ghl
25
6
C04
GGU GGL
GPU ghl
ghu
136
GGL GGU GGL GGU GGL
ghl GPU
ghl
ghu
109
78
98
978
778
GGL GGU
35
70
698
GGL
252
62
Cabrio® Balcony
GGL
624
55
Roof Windows
4000
120
1200
CFP
Cvp
mm
cm
u12
120120
780
78
1140
114
1340
134
1140
114
mm
cm
780
78
1140
114
1340
134
1340
134
Table shows external frame sizes. Please refer to installation instructions for trimmed
opening sizes.
VELUX 151
VELUX Company Ltd
Wellingborough Road
Kettering Parkway
Kettering
Northants
NN15 6XR
VELUX Company Ltd
Unit 1, Willsborough
Cluster
Willsborough Industrial
Estate
Clonshaugh
Dublin 17
Ireland
installers’ handbook. vas 451767-2011-01. © 2011 VELUX Group ®V ELUX and the VELUX logo are registered trademarks used under licence by the VELUX Group
VELUX Company Ltd
Woodside Way
Glenrothes
Fife
Scotland
KY7 4ND