Insuletics Ltd INSULETICS EXTERNAL WALL INSULATION

Insuletics Ltd INSULETICS EXTERNAL WALL INSULATION
Insuletics Ltd
APPROVAL
INSPECTION
TESTING
CERTIFICATION
Genesis Centre
North Staffs Business Park
Innovation Way
Stoke-on-Trent
Staffordshire ST6 4BF
Tel: 01782 366090 Fax: 01782 366091
TECHNICAL APPROVALS FOR CONSTRUCTION
Agrément Certificate
12/4918
e-mail: [email protected]
website: www.insuletics.co.uk
Product Sheet 7
INSULETICS EXTERNAL WALL INSULATION SYSTEMS
INSUL-SIL P EXTERNAL WALL INSULATION SYSTEM
This Agrément Certificate Product Sheet (1) relates
to the Insul-Sil P External Wall Insulation System,
comprising mechanically-fixed phenolic boards with
a mesh-reinforced basecoat and render finish, and
suitable for use on new or existing domestic and
non-domestic buildings.
(1) Hereinafter referred to as ‘Certificate’.
CERTIFICATION INCLUDES:
• factors relating to compliance with Building
Regulations where applicable
• factors relating to additional non-regulatory
information where applicable
• independently verified technical specification
• assessment criteria and technical investigations
• design considerations
• installation guidance
• regular surveillance of production
• formal three-yearly review.
KEY FACTORS ASSESSED
Thermal performance — the system can be used to improve the thermal performance of external walls or contribute
to meet the requirements of the Building Regulations (see section 6).
Strength and stability — the system can adequately resist wind loads and impact damage (see section 7).
Behaviour in relation to fire — the system has an B-s1, d0 reaction to fire classification in accordance with
BS EN 13501-1 : 2007 (see section 8).
Risk of condensation — the system can contribute to limiting the risk of interstitial and surface condensation
(see section 11).
Durability — when installed and maintained in accordance with the Certificate holder’s recommendations and the
terms of this Certificate, the system should remain effective for at least 30-years (see section 13).
The BBA has awarded this Certificate to the company named above for the system described herein. This system
has been assessed by the BBA as being fit for its intended use provided it is installed, used and maintained as set
out in this Certificate.
On behalf of the British Board of Agrément
Date of First issue: 12 March 2014
John Albon — Head of Approvals
Claire Curtis-Thomas
Energy and Ventilation
Chief Executive
The BBA is a UKAS accredited certification body — Number 113. The schedule of the current scope of accreditation for product certification is
available in pdf format via the UKAS link on the BBA website at www.bbacerts.co.uk
Readers are advised to check the validity and latest issue number of this Agrément Certificate by either referring to the BBA website or contacting the BBA direct.
British Board of Agrément
Bucknalls Lane
Watford
Herts WD25 9BA
©2014
Page 1 of 16
tel: 01923 665300
fax: 01923 665301
e-mail: [email protected]
website: www.bbacerts.co.uk
Regulations
In the opinion of the BBA, the Insul-Sil P External Wall Insulation System, if installed, used and maintained in
accordance with this Certificate, can satisfy or contribute to satisfying the relevant requirements of the following
Building Regulations (the presence of a UK map indicates that the subject is related to the Building Regulations in the
region or regions of the UK depicted):
The Building Regulations 2010 (England and Wales) (as amended)
Requirement: A1
Loading
Comment:
Requirement: B4(1)
External fire spread
The system can sustain and transmit wind loads to the substrate wall. See section 7.4 of this Certificate.
Comment:
The system can satisfy or contribute to satisfying this Requirement. See sections 8.1 to 8.3, 8.5 and 8.6 of
this Certificate.
Requirement: C2(b)
Resistance to moisture
Comment:
Requirement: C2(c)
Resistance to moisture
The system provides a degree of protection against rain ingress. See sections 4.4 and 10.1 of this Certificate.
Comment:
The system can contribute to minimising the risk of interstitial and surface condensation. See sections 11.1,
11.2 and 11.4 of this Certificate.
Requirement: L1(a)(i)
Conservation of fuel and power
Comment:
Regulation:
7
Materials and workmanship
Comment:
Regulation:
26
CO2 emission rates for new buildings
The system can contribute to satisfying this Requirement. See sections 6.2 and 6.3 of this Certificate.
The system is acceptable. See section 13.1 and the Installation part of this Certificate.
The system will enable, or contribute to enabling, a wall to satisfy the U value requirement. See sections
6.2 and 6.3 of this Certificate.
Comment:
The Building (Scotland) Regulations 2004 (as amended)
Regulation:
8(1)(2)
Durability, workmanship and fitness of materials
The system can contribute to a construction satisfying this Regulation. See sections 12.1, 13.1 and the
Installation part of this Certificate.
Comment:
Regulation:
Standard:
9
1.1
Building standards applicable to construction
Structure
Comment:
Standard:
2.6
Spread to neighbouring buildings
The system can sustain and transmit wind loads to the substrate wall. See section 7.4 of this Certificate.
The system is regarded as ‘low risk’ and, therefore, can satisfy this Standard, with reference to clauses
2.6.4(1)(2), 2.6.5(1) and 2.6.6(2). See sections 8.1 to 8.7 of this Certificate.
Comment:
Standard:
2.7
Standard:
3.10
3.15
6.1(b)
6.2
7.1(a)(b)
Statement of sustainability
The system can contribute to satisfying the relevant requirements of Regulation 9, Standards 1 to 6, and,
therefore, will contribute to a construction meeting the bronze level of sustainability as defined in this Standard.
In addition, the system can contribute to a construction meeting a higher level of sustainability as defined in
this Standard with reference to clauses 7.1.4(1)(2) [Aspect 1(1)(2) and 2(1)], 7.1.6(1)(2) [Aspect 1(1)(2) and 2(1)]
and 7.1.7(1)(2) [Aspect 1(1)(2)]. See sections 6.2 and 6.3 of this Certificate.
Comment:
Regulation:
Carbon dioxide emissions
Buildings insulation envelope
The system can contribute to satisfy these Standards, with reference to clauses (or parts of) 6.1.1(1),
6.1.2(1)(2), 6.1.3(1)(2), 6.1.6(1), 6.1.10(2), 6.2.1(1)(2), 6.2.3(1), 6.2.4(2), 6.2.5(2), 6.2.6(1), 6.2.7(1), 6.2.8(2),
6.2.9(1)(2), 6.2.10(1), 6.2.11(1), 6.2.12(2) and 6.2.13(1)(2). See sections 6.2 and 6.3 of this Certificate.
Comment:
Standard:
Condensation
The system will satisfy the requirements of this Standard, with reference to clauses 3.15.1(1)(2), 3.15.4(1)(2)
and 3.15.5(1)(2). See sections 11.3 and 11.4 of this Certificate.
Comment:
Standard:
Standard:
Precipitation
The system will contribute to a construction satisfying this Standard, with reference to clauses 3.10.1(1)(2)
and 3.10.2(1)(2). See sections 4.4 and 10.1 of this Certificate.
Comment:
Standard:
Spread on external walls
The system can satisfy the requirements of this Standard, with reference to clauses 2.7.1(1)(2) and 2.7.2(2).
See sections 8.1 to 8.7 of this Certificate.
Comment:
12
Building standards applicable to conversions
All comments given for the system under Regulation 9, Standards 1 to 6, also apply to this Regulation, with
reference to clause 0.12.1(1)(2) and Schedule 6(1)(2).
Comment
(1) Technical Handbook (Domestic).
(2) Technical Handbook (Non-Domestic).
The Building Regulations (Northern Ireland) 2012
Regulation:
Comment:
23
Fitness of materials and workmanship
The system is acceptable. See section 13.1 and the Installation part of this Certificate.
Page 2 of 16
Regulation:
28(b)
Regulation:
Resistance to moisture and weather
The system provides a degree of protection against rain ingress. See sections 4.4 and 10.1 of
this Certificate.
Comment:
29
Condensation
The system can contribute to minimising the risk of interstitial and surface condensation. See sections 11.2
and 11.4 of this Certificate.
Comment:
Regulation:
30
Stability
Comment:
Regulation:
36(a)
External fire spread
The system can sustain and transmit wind loads to the substrate wall. See section 7.4 of this Certificate.
The system can satisfy or contribute to satisfying this requirement. See sections 8.1 to 8.3, 8.5 and 8.6 of
this Certificate.
Comment:
Regulation:
39(a)(i)
Conservation measures.
Regulation:
40
Target carbon dioxide emission rate
The system can contribute to satisfying these Regulations. See sections 6.2 and 6.3 of this Certificate.
Comment:
The system can contribute to satisfying these Regulations. See sections 6.2 and 6.3 of this Certificate.
Construction (Design and Management) Regulations 2007
Construction (Design and Management) Regulations (Northern Ireland) 2007
Information in this Certificate may assist the client, CDM co-ordinator, designer and contractors to address their
obligations under these Regulations.
See section:
3 Delivery and site handling (3.2 and 3.4) of this Certificate.
Additional Information
NHBC Standards 2014
NHBC accepts the use of the Insul-Sil P External Wall Insulation System, provided it is installed, used and maintained
in accordance with this Certificate, in relation to NHBC Standards, Part 6 Superstructure (excluding roofs), Chapter
6.9 Curtain walling and cladding.
Technical Specification
1 Description
1.1 The Insul-Sil P External Wall Insulation System consists of phenolic insulation boards which are mechanically fixed
to the substrate wall through the reinforcing mesh or directly through the insulation, high polymer content basecoat and
a silicone render finish. The system comprises of the following components, see Figure 1.
Insulation
• Insul-Phen Board (phenolic) insulation — 1200 mm by 600 mm in a range of thicknesses between 40 mm and
130 mm in 10 mm increments, with a nominal density of 40 kg·m–3, a minimum tensile strength of 50 kN·m–2
and a minimum compressive strength of 150 kN·m–2. Boards are manufactured to comply with the requirements of
BS EN 13166 : 2012.
Mechanical fixings
• mechanical fixings(1) — proprietary external wall insulation fixings of adequate length to suit the substrate and
insulation thickness, selected from:
— Ejotherm NT U — polyethylene, PE-HD with stainless steel or electro-galvanized pins
— Ejotherm STR U — polyethylene, PE-HD with stainless steel or electro-galvanized screws
• The Ejot SBL 140, a proprietary 140 mm diameter polyamide extension washer, can be used in conjunction with
the above anchors to enhance the pull-through capacity.
(1) Other fixings may be used provided they can be demonstrated to have equal or higher pull-out and plate stiffness characteristics.
Basecoat
Insul-Poly14 Basecoat — a cement-based, polymer-modified basecoat. It is supplied as a powder, to which only
potable water is added in the correct proportion, and applied to an overall thickness of 6 mm or greater.
Reinforcement
reinforcing mesh — an alkali-resistant glassfibre mesh in 50 m by 1 m rolls, with mesh size of 3.5 mm by 3.5 mm,
organic content of 20%, PCS value of 8.17 MJ·kg–1 and nominal weight of 160 g·m–2.
Primer
Insuletics Insul-Primer — available in a range of various colours to suit colour of finish selected.
Finish
Insul-Sil Render — a decorative topcoat in 15 and 30 grades available in a range of colours.
Page 3 of 16
Figure 1 Insuletics External Wall Insulation System
1.2 Ancillary materials also used with the system but outside of the scope of this Certificate:
• profiles — a range of standard profiles for details such as bases, edge stops, corners, render stops, movement joints
and expansion joints, available in either aluminium, galvanized steel with a polyester powder paint or stainless steel
• profile connectors and fixings
• silicone-based joint sealant
• PU foam.
1.3 For the through pinned installation method, the insulation boards are secured mechanically fixed to the substrate,
secured initially with one centrally placed mechanical fixing. A thickness of 3 mm of the basecoat should is applied to
the surface of the insulation. The glassfibre mesh should be embedded in the wet render using the trowel and secured
with a minimum of either four or five mechanical fixings per board. A second 3 mm thick coat of basecoat is applied
to give a total render thickness of 6 mm. When dry, primer is applied, followed by the application of the decorative
finish coat. For the non-through pinned installation method the fixings are installed just through the insulation using the
project specific fixing pattern prior to application of the basecoat, reinforcement mesh and decorative topcoat.
Page 4 of 16
2 Manufacture
•
•
•
•
•
•
•
As part of the assessment and ongoing surveillance of the quality of the system components, the BBA has:
agreed with the manufacturer the quality control procedures and product testing to be undertaken
assessed and agreed the quality control operated over batches of incoming materials
monitored the production process and verified that it is in accordance with the documented process
evaluated the process for management of nonconformities
checked that equipment has been properly tested and calibrated
undertaken to carry out the above measures on a regular basis through a surveillance process, to verify that the
specifications and quality control operated by the manufacturer are being maintained.
3 Delivery and site handling
3.1 The insulation is delivered to site shrink-wrapped in polythene packs bearing the manufacturer’s and product
identification marks and batch numbers.
3.2 Components are delivered in the quantities and packages listed in Table 1. Each package carries the
manufacturer’s and product identification and batch number. The basecoat and render also include the BBA logo
incorporating the number of this Certificate.
Table 1 Component supply details
Component
Quantity and packaging
Insuletics Insul-Sil Render 15 and 30 grades
25 kg tub
Insuletics Insul-Primer
15 kg tub
Insuletics Insul-Poly 14 Basecoat
25 kg bag
Reinforcing mesh
1 m x 50 m roll
Fixings
Insul-Phen Board (phenolic) Insulation
boxed by the manufacturer
shrunk-wrapped in individual packs — number of boards varies
depending on thickness
3.3 The insulation boards should be stored on a firm, clean, level base, off the ground and must be protected from
prolonged exposure to sunlight either by storing opened packs under cover in dry conditions or re-covering with
opaque polythene sheeting.
3.4 Care must be taken when handling the insulation boards to avoid both damage and contact with solvents or
bitumen products. The boards must not be exposed to open flame or other ignition sources. Boards that become
damaged, soiled or wet should be discarded.
3.5 The powder components should be stored in dry conditions, off the ground, and protected from frost at all times.
Bags of unopened render will have a shelf-life of 12 months when stored correctly.
3.6 Primers and synthetic paste render finishes should be stored in dry conditions, off the ground and be protected
from frost at all times. Damaged, wet or contaminated products should not be used and must be discarded.
Assessment and Technical Investigations
The following is a summary of the assessment and technical investigations carried out on the Insul-Sil P External Wall
Insulation System.
Design Considerations
4 General
4.1 The Insul-Sil P External Wall Insulation System, when installed in accordance with this Certificate, is effective in
reducing the thermal transmittance (U value) of the external masonry walls of new and existing buildings. It is essential
that the detailing techniques specified in this Certificate are carried out to a high standard if the ingress of water into
the insulation is to be avoided and the full thermal benefit obtained from the system. Only details specified by the
Certificate holder should be used.
4.2 The system will improve the weather resistance of a wall and provide a decorative finish. However, it may be
installed only where there are no signs of dampness on the inner surface of the wall, other than those caused solely by
condensation.
4.3 The system is applied to the outside of external walls of masonry and dense or no-fines concrete construction and
is suitable for use on new or existing domestic or non-domestic buildings. Prior to installation of the systems, the wall
surfaces should comply with section 14 of this Certificate.
Page 5 of 16
4.4 New buildings subject to national Building Regulations should be constructed in accordance with the
relevant recommendations of:
• BS EN 1996-2 : 2006 and its UK National Annex — the designer should select a construction appropriate to the
local wind-driven rain index, paying due regard to the design detailing, workmanship and materials to be used
• BS 8000-3: 2001.
4.5 Other new buildings not subject to regulatory requirements should also be built in accordance with the Standards
identified in section 4.4.
4.6 The effect of the installation of the system on the acoustic performance of a construction is outside the scope of this
Certificate.
4.7 The fixing of rainwater goods, satellite dishes, clothes lines, hanging baskets and similar items is outside the scope
of this Certificate.
4.8 It is essential that the system is installed and maintained in accordance with the conditions set out in this Certificate.
4.9 External plumbing should be removed before installation and alterations made to underground drainage, where
appropriate, to accommodate repositioning of the plumbing on the finished face of the system.
5 Practicability of installation
The system should only be installed by specialised contractors who have successfully undergone training and
registration by the Certificate holder.
Note: The BBA operates a UKAS Accredited Approved Installer Scheme for external wall insulation; details of installer
companies approved are included on the BBA’s website (www.bbacerts.co.uk).
6 Thermal performance
6.1 Calculations of the thermal transmittance (U value) should be carried out in accordance with BS EN ISO 6946 :
2007 and BRE Report BR 443 : 2006, using declared thermal conductivity (␭D values) given in Table 2.
Table 2 Declared thermal conductivity values
Insulation
Insul-Phen Board
Insulation
Thickness (mm)
␭D value (W·m–1·K–1)
25 to 44
> 45
0.021
0.020
6.2 The U value of a completed wall will depend on the thickness of the insulation used, the number and type
of fixings, the insulating value of the substrate masonry and its internal finish. Example U values of walls
incorporating the system are given in Table 3.
Table 3 Insulation thickness required to achieve U value (1)(2)(3)
U value
(W·m–2·K–1)
0.19
0.25
0.26
0.28
0.30
0.35
Thickness of insulation(4) (mm)
215 mm Brickwork,
␭ = 0.56 W·m–1·K–1
200 mm Dense blockwork,
␭ = 1.75 W·m–1·K–1
100
80
70
70
60
50
110
80
80
70
70
60
(1) Wall construction inclusive of 13 mm plaster (␭ = 0.57 W·m–1·K–1), 5 mm
render (␭ = 1.0 W·m–1·K–1). Brickwork (protected) with 17.1% mortar or
dense blockwork with 6.7% mortar (␭ = 0.88 W·m–1·K–1). Insulation ␭D as per
section 6.1.
(2) Calculation based on a system that included 7 fixings per m2 with a point
thermal transmittance ⌾p = 0.002 W·K–1. Use of other types of fixings should
be calculated in accordance with BS EN ISO 6946 : 2007.
(3) Based on calculations in accordance with BS EN ISO 6946 : 2007.
(4) Based upon incremental insulation thickness of 10 mm.
6.3 The system can maintain, or contribute to maintaining, continuity of thermal insulation at junctions between external
walls and junctions. Details shown in section 16 will allow use of the ␺-values (Psi) for Accredited Construction Details
in Emission Rate calculations to SAP 2009 or the Simplified Building Energy Model (SBEM). Guidance on limiting heat
loss at junctions can be found in:
Page 6 of 16
England and Wales — Approved Documents to Part L and, for new thermal elements to existing buildings, Accredited
Construction Details (version 1.0). For new-build, see also SAP 2009, Appendix K, and the iSBEM User Manual
Scotland — Accredited Construction Details (Scotland)
Northern Ireland — Accredited Construction Details (version 1.0).
7 Strength and stability
7.1 When installed on suitable walls, the system can adequately transfer to the wall the self-weight and negative
(suction) and positive (pressure) wind loads normally experienced in the United Kingdom.
7.2 Positive wind load is transferred to the substrate wall directly via bearing and compression of the render,
and insulation.
7.3 Negative wind pressure is resisted by the bond between each component. The insulation boards are retained by
the fixing anchors and secured through the reinforcing mesh to the wall with the appropriate fixings.
7.4 The wind loads on the wall should be calculated in accordance with BS EN 1991-1-4 : 2005 and UK
National Annex. Special consideration should be given to locations with high wind-load pressure coefficients as
additional fixings may be necessary. In accordance with BS EN 1990 : 2002 and its UK National Annex, it is
recommended that a load factor of 1.5 is used to determine the ultimate wind load to be resisted by the system.
7.5 Assessment of structural performance for individual buildings must be carried out by a suitably qualified and
experienced person to confirm that:
• the substrate wall has adequate strength to resist additional loads that may be applied as a result of installing the
system, ignoring any contribution that may occur from the insulation system.
• the proposed system and associated fixing layout provides adequate resistance to negative wind loads based on
the results of the site investigation and test results.
• an appropriate number of site-specific pull-out tests conducted on the substrate of the building to determine the
minimum resistance to failure of the fixings. The characteristic pull-out resistance should be determined in accordance
with the guidance given in ETAG 014 : 2002, Annex D.
7.6 The number and centres of fixings should be determined by the system designer. Provided the substrate wall is
suitable and an appropriate fixing is selected, the mechanical fixings will adequately support and transfer the weight of
the render insulation system to the substrate wall.
7.7 Typical characteristic pull-out strengths for the fixings taken from the corresponding European Technical Approval
(ETA) are given in Table 4; however, these values are dependent on the substrate and the fixing must be selected to
suit the loads and substrate concerned.
Table 4 Fixings — typical characteristic pull-out strengths
Fixing type
ETA Number
Substrate
Drill hole
diameter (mm)
Minimum effective
anchorage depth (mm)
Typical pull-out
strength(1) (kN)
Ejotherm NT U
05/0009
Concrete C12/15/Clay bricks
8
25
1.2/1.5
Ejotherm STR U
04/0023
Concrete C12/15/Clay bricks
8
25
1.5/1.5
(1) Values are determined in accordance with ETAG 014 : 2002 and are dependent on the substrate.
7.8 The resistance forces data are given in Table 5 and are the results of calculations determined by BBA based upon:
• characteristic resistances from static foam block test on anchors through the mesh with 60 mm diameter plates
• characteristic pull-through resistances from tests on anchors through the insulation with 60 mm diameter plates and
140 mm diameter extension washer.
Table 5 Static foam block and pull through resistances
Factor (unit)
Insulation thickness (mm)
Plate diameter of anchor (mm)
Fixings types
Characteristic pull-through resistance(4) (per anchor) (N)
Factor of safety
Design pull-through anchor resistance(5) (N)
(1)
(2)
(3)
(4)
(5)
Mesh + Insulation value(1)
60
60
See Table 4
1180
2.5
472
Insulation value (2)
60
60
257
2.5
103
80
60
60
60 (3)
See Table 4
548
335
2.5
2.5
219
134
80
60 (3)
712
2.5
285
Calculation based on static foam block test on anchors through the mesh.
Calculation based on pull-through of anchors directly through insulation.
The fixing is used with a 140 mm diameter anchor extension washer— SBL 140 Plus.
Characteristic value in accordance with BS EN 1990 : 2002, Annex D7.2.
The safety factor of 2.5 is applied and based on the assumption that all insulation boards are quality controlled tested to establish tensile strength
perpendicular to the face of the board.
Page 7 of 16
Impact loading
7.8 Hard body impact tests were carried out in accordance with ETAG 004 : 2011. The system is suitable for use in
Use Categories(1) II and III.
(1) The Use Categories are defined in ETAG 004 : 2011 as:
• Category I — a zone readily accessible at ground level to the public and vulnerable to hard body impacts but not subjected to abnormally rough use
• Category II — a zone liable to impacts from thrown or kicked objects, but in public locations where the height of the system will limit the size of
the impact; or at lower levels where access to the building is primarily to those with some incentive to exercise care
• Category III — a zone not likely to be damaged by normal impacts caused by people or by thrown or kicked objects.
8 Behaviour in relation to fire
8.1 The overall classification for the complete system built in accordance with BS EN 13501-1 : 2007,
is B-s1, d0.
8.2 The classification applies to the full range of thicknesses and finishes covered by the Certificate.
8.3 For houses in Scotland, and for all buildings in England and Wales and Northern Ireland, the system is suitable
for use on, or at any distance from, the boundary.
8.4 For flats and maisonettes and non-domestic buildings in Scotland, the system is suitable only for use more
than one metre from the boundary, except for the system detailed in section 8.6 of this Certificate, which is
suitable for use on, or at any distance from the boundary.
8.5 The system is restricted for use in buildings up to 18 metres in height except for the system detailed in
section 8.6 of this Certificate.
8.6 For buildings installed with system using insulation thickness up to 130 mm and one stainless steel mechanical
fixing with 80 mm washer through the reinforcement mesh, there is no restriction on the height. The system described
has been tested and met the performance criteria set in BRE Report BR 135 : 2003, Annex A. For the other insulation
thicknesses refer to sections 8.4 to 8.6 of this Certificate.
8.7 The system is not classified as ‘non-combustible’ therefore, calculations for unprotected areas may apply
dependent on the fire resistance characteristics of the wall, except for the system detailed in section 8.6 of
this Certificate.
8.8 Application to second storey walls and above it is recommended that the designer includes at least one stainless
steel fixing per square metre, as advised in BRE Report BR 135 : 2013.
9 Proximity of flues and appliances
When the system is installed in close proximity to certain flue pipes the relevant provisions of the national Building
Regulations should be met:
England and Wales — Approved Document J
Scotland — Mandatory Standard 3.19, clause 3.19.4(1)(2)
(1) Technical Handbook (Domestic).
(2) Technical Handbook (Non-Domestic).
Northern Ireland — Technical Booklet L.
10 Water resistance
10.1 The system will provide a degree of protection against rain ingress. However, care should be taken to
ensure that substrate walls are adequately weathertight prior to its application. The insulation system shall only be
installed where there are no signs of dampness on the inner surface of the substrate other than those caused
solely by condensation.
10.2 Designers and installers should take particular care in detailing around openings, penetrations and movement
joints to minimise the risk of rain ingress. Only details approved by the Certificate holder should be used.
10.3 The guidance given in BRE Report BR 262 : 2002 should be followed in connection with the weathertightness
of solid wall constructions. The designer should select a construction appropriate to the local wind-driven rain index,
paying due regard to the design detailing, workmanship and materials to be used.
10.4 At the tops of walls, the system should be protected by an adequate overhang or other detail designed for use
with this type of system.
11 Risk of condensation
11.1 Designers must ensure that an appropriate condensation risk analysis has been carried out for all parts of
a construction, including at junctions, openings and penetrations to minimise the risk of condensation. The
recommendations of BS 5250 : 2011 should be followed.
Page 8 of 16
Surface condensation
11.2 Walls will adequately limit the risk of surface condensation when the thermal transmittance (U value)
does not exceed 0.7 W·m–2·K–1 at any point and the junctions with other elements and openings comply with
section 6.3.
11.3 Walls will adequately limit the risk of surface condensation when the thermal transmittance (U value)
does not exceed 1.2 W·m–2·K–1 at any point. Guidance may be obtained from BS 5250 : 2011 (Section 8,
Annex D) and BRE Report BR 262 : 2002.
Interstitial condensation
11.4 Walls incorporating the system will adequately limit the risk of interstitial condensation when they are
designed and constructed in accordance with this Certificate.
11.5 The render used with the system has an equivalent air layer of thickness (Sd) of 0.33 m. This corresponds to a
water vapour resistance factor (µ) of 39 for a render system of thickness of 8.5 mm
11.6 The water vapour resistance factor (µ) for the phenolic insulation boards is 50, as taken from BS EN ISO 10456 :
2007, Table 4.
12 Maintenance and repair
12.1 Regular checks should be made on the installed system, including:
•
•
•
•
visual inspection of the render for signs of damage. Cracks in the render exceeding 0.2 mm must be repaired
examination of the sealant around openings and service entry points
visual inspection of architectural details designed to shed water to confirm that they are performing properly
visual inspection to ensure that water is not leaking from external downpipes or gutters; such leakage could
penetrate the rendering
• necessary repairs effected immediately and the sealant joints at window and door frames replaced at regular intervals
• maintenance schedules, which should include the replacement and resealing of joints, for example between the
insulation systems and window and door frame.
12.2 Damaged areas must be repaired using the appropriate components and the procedures detailed in the
Certificate holder’s installation instructions and in accordance with BS EN 13914 : 2005.
13 Durability
13.1 The system should remain effective for at least 30-years, provided any damage to the surface finish is
repaired immediately, and regular maintenance is undertaken as described in section 12 of this Certificate.
13.2 The finishes may break up the flow of water on the surface and reduce the risk of discoloration by water runs.
The finish may become discoloured with time, the rate depending on locality, initial colour, the degree of exposure and
atmospheric pollution, as well as the design and detailing of the wall. In common with traditional renders, discoloration
by algae and lichens may occur in wet areas. The appearance may be restored by a suitable power wash or, if
required, by over coating.
13.3 To maintain a high quality aesthetic appearance, it may be necessary to periodically overcoat the building using
system compatible coatings recommended by the Certificate holder and in accordance with BS EN 1062-1 : 2004.
Care should be taken not to adversely affect the water vapour transmission or fire characteristics of the system. The
advice of the Certificate holder should be sought as to the suitability of a particular product.
Installation
14 Site survey and preliminary work
14.1 A pre-installation survey of the property is carried out to determine suitability for treatment and the need for
any necessary repairs to the building structure before application of the Insul-Sil P External Wall Insulation System. A
specification is prepared for the building indicating:
• the position of beads
• detailing around windows, doors and at eaves
• damp-proof course (dpc) level
• exact position of expansion joints
• areas where flexible sealants must be used
• any alterations to external plumbing
• the position of fire barriers, where required.
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14.2 The survey should include tests conducted on the walls of the building by the Certificate holder or their approved
installers (see section 15) to determine the pull-out resistance of the proposed mechanical fixings. An assessment and
recommendation is made on the type and number of fixings required to withstand the building’s expected wind loading
based on calculations using the relevant wind speed data for the site and the pull-out resistances (see section 7).
14.3 Surfaces should be sound, clean and free from loose material. The flatness of surfaces must be checked; this
may be achieved using a straight-edge spanning the storey height. Any excessive irregularities, ie greater than 10 mm
in 1 metre, must be made good prior to installation to ensure that the insulation boards are installed with a smooth,
in-plane finished surface.
14.4 On existing buildings, purpose-made window sills must be fitted to extend beyond the finished face of the system
(see Figure 4). New buildings should incorporate suitably deep sills.
14.5 Where surfaces are covered with an existing rendering, it is essential that the bond between the background
and the render is adequate. All loose areas should be hacked off and reinstated.
14.6 Internal wet work, eg screeding or plastering, should be completed and allowed to dry prior to the application
of a system.
15 Approved installers
Application of the system, within the context of this Certificate, is carried out by approved installers recommended or
recognised by the Certificate holder. Such an installer is a company:
• employing operatives who have been trained and approved by the Certificate holder to install the system
• which has undertaken to comply with the Certificate holder’s application procedure, containing the requirement for
each application team to include at least one member operative trained by the Certificate holder
• subject to at least one inspection per annum by the Certificate holder to ensure suitable site practices are be
employed. This may include unannounced site inspections.
16 Procedure
General
16.1 Application is carried out in accordance with the Certificate holder’s current installation instructions.
16.2 Weather conditions should be monitored to ensure correct application and curing conditions. Application of the
coating material should not be applied at temperatures below 5°C or above 30°C nor if exposure to frost is likely. In
addition, the coating must be protected from rapid drying.
16.3 All rendering should be in accordance with the relevant recommendations of BS EN 13914-1 : 2005.
Positioning and securing insulation boards
16.4 The base profile is secured to the external wall above the dpc using profile fixings at 300 mm maximum centres
(see Figure 2). Beads and expansion joints are incorporated as specified.
Figure 2 Typical section at base level
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16.5 The first run of insulation boards is positioned on the base profile. The insulation board is securely fixed to
the substrate starting at the base trim level using the project-specific fixing type and layout as shown in the project
specification and drawings (see Figure 3).
Figure 3 Typical fixing pattern
16.6 The boards are always laid in brick-bond fashion (see Figure 3). Care must be taken to ensure that the boards
are fitted tightly to each other. The boards are interlocked on the external corners. Gaps are filled with expanding PUR
foam. The line and level are checked as work progresses.
16.7 Holes are drilled into the substrate to a required depth. Care is taken to ensure that the depth of embedment of
the fixing into the substrate is as specified. Allowance is made where either existing render is on the wall or dubbing
out render has been used to align the boards as the effective embedment will be reduced. Depending on the project
design requirements, mechanical fixings are inserted directly through insulation or the reinforcing mesh (after basecoat
has been applied) and insulation and tapped firmly into place, securing the insulation board to the substrate. The
fixings are either hammered or screwed in depending on the type specified.
16.8 To fit around details such as doors and windows, insulation boards may be cut with a sharp knife or a finetoothed saw. If required, purpose-made window sills are fitted at this stage. They are designed to prevent water ingress
and incorporate drips to shed water clear of the system (see Figure 4).
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Figure 4 Details around openings
16.9 Installation continues until the whole wall is completely covered including, where appropriate, the building soffits.
Only details specified and approved by the certificate holder may be used.
Movement joints and render beads
16.10 Movement joints in the substrate must be continued through the system. This may necessitate the use of back-toback full system stop beads with a mastic seal and backer strip depending on the width of the joint and the degree of
movement anticipated. Additional expansion joints in the insulation system are determined by the Certificate holder at
the time of initial survey. Each project is considered on its own merits and the Certificate holder will take into account
construction format, building design and fenestration when determining the regularity and positioning of both vertical
and horizontal expansion joints in the system (see Figure 5).
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Figure 5 Expansion joint
Reinforcing
16.11 The Insul-Poly 14 Basecoat should be mixed with from 4 to 5 litres of potable water per 25 kg bag for a
minimum of 5 minutes with an electric paddle mixer to disperse the additives. Corner beads with integral glassfibre
wings should be fitted to all corners using the Insul-Poly14 Basecoat. A thickness of 3 mm of the basecoat should be
applied to the surface of the insulation using a stainless steel trowel or a render pump. The glassfibre mesh should be
embedded in the wet render using the trowel and mechanical fixings applied if required by the project specification.
The sheets of mesh should be lapped by a minimum of 100 mm. Diagonal patches of mesh approximately 300 mm by
200 mm should also be installed at the corners of window/door openings (see Figure 8).
16.12 The second 3 mm thick coat of basecoat should be applied to give a total render thickness of 6 mm. The
surface of the basecoat should be sponged up smooth to provide a smooth surface for the Insul-Sil finish.
Figure 6 Additional reinforcement at openings
Render finish
16.13 The basecoat should be left to dry thoroughly before the application of Insul-Sil Render. Depending on the
prevailing conditions, the render may take three days to dry/cure completely prior to the application of the primer/
finish.
16.14 The primer is applied to the basecoat in accordance with the Certificate holder’s instructions and allowed to
dry for approximately 24 hours prior to the application of the Insul-Sil finishing coat.
16.15 The finishing coat should be applied in accordance with the Certificate holder’s instructions.
16.16 Care should be should be taken in the detailing of the system around features such as openings, projections
and at eaves (see Figure 7) to ensure adequate protection against water ingress and to limit the risk of water
penetrating the system.
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Figure 7 Eaves details
16.17 On completion, external fittings are re-fixed to the substrate using suitable fixing pads previously installed
in the system.
Technical Investigations
17 Tests
An examination was made of data relating to:
• resistance to freeze/thaw
• heat/spray cycling
• impact resistance
• component characterisation
• water vapour permeability
• fire performance
• durability of finish coatings.
18 Investigations
18.1 The manufacturing process was evaluated, including the methods adopted for quality control, and details were
obtained of the quality and composition of materials used.
18.2 An assessment of the risk of interstitial condensation was undertaken.
18.3 The practicability of installation and the effectiveness of detailing techniques were examined.
Page 14 of 16
Bibliography
BS 5250 : 2011 Code of practice for control of condensation in buildings
BS 8000-3 : 2001 Workmanship on building sites — Code of practice for masonry
BS EN 1062-1 : 2004 Paints and varnishes — Coating materials and coating systems for exterior masonry and
concrete — Classification
BS EN 1990 : 2002 Eurocode — Basis of structural design
NA to BS EN 1990 : 2002 UK National Annex to Eurocode — Basis of structural design
BS EN 1991-1-4 : 2005 Eurocode 1 — Actions on structures — General actions — Wind actions
NA to BS EN 1991-1-4 : 2005 UK National Annex to Eurocode 1 — Actions on structures — General actions —
Wind actions
BS EN 1996-2 : 2006 Eurocode 6 — Design of masonry structures — Design considerations, selection of materials
and execution of masonry
NA to BS EN 1996-2 : 2006 UK National Annex to Eurocode 6 — Design of masonry structures — Design
considerations, selection of materials and execution of masonry
BS EN 13166 : 2012 Thermal insulation products for buildings — Factory made phenolic foam (PF) products —
Specification
BS EN 13501-1 : 2007 Fire classification of construction products and building elements — Classification using test
data from reaction to fire tests
BS EN 13914-1 : 2005 Design, preparation and application of external rendering and internal plastering — External
rendering
BS EN ISO 6946 : 2007 Building components and building elements — Thermal resistance and thermal transmittance
— Calculation method
BS EN ISO 10456 : 2007 Building materials and products — Hygrothermal properties — Tabulated design values
and procedures for determining declared and design thermal values
BRE Report (BR 135 : 2013) Fire Performance of External Thermal Insulation for Walls of Multistorey Buildings
BRE Report (BR 262 : 2002) Thermal insulation: avoiding risks
BRE Report (BR 443 : 2006) Conventions for U-value calculations
ETAG 004 : 2011 External Thermal Insulation Composite Systems with Rendering
ETAG 014 : 2002 Plastic Anchors for ETICS
Page 15 of 16
Conditions of Certification
19 Conditions
19.1 This Certificate:
• relates only to the product/system that is named and described on the front page
• is issued only to the company, firm, organisation or person named on the front page — no other company, firm,
organisation or person may hold or claim that this Certificate has been issued to them
• is valid only within the UK
• has to be read, considered and used as a whole document — it may be misleading and will be incomplete to be
selective
• is copyright of the BBA
• is subject to English Law.
19.2 Publications, documents, specifications, legislation, regulations, standards and the like referenced in this Certificate
are those that were current and/or deemed relevant by the BBA at the date of issue or reissue of this Certificate.
19.3 This Certificate will remain valid for an unlimited period provided that the product/system and its manufacture
and/or fabrication, including all related and relevant parts and processes thereof:
• are maintained at or above the levels which have been assessed and found to be satisfactory by the BBA
• continue to be checked as and when deemed appropriate by the BBA under arrangements that it will determine
• are reviewed by the BBA as and when it considers appropriate.
19.4 The BBA has used due skill, care and diligence in preparing this Certificate, but no warranty is provided.
19.5 In issuing this Certificate, the BBA is not responsible and is excluded from any liability to any company, firm,
organisation or person, for any matters arising directly or indirectly from:
• the presence or absence of any patent, intellectual property or similar rights subsisting in the product/system or any
other product/system
• the right of the Certificate holder to manufacture, supply, install, maintain or market the product/system
• actual installations of the product/system, including their nature, design, methods, performance, workmanship and
maintenance
• any works and constructions in which the product/system is installed, including their nature, design, methods,
performance, workmanship and maintenance
• any loss or damage, including personal injury, howsoever caused by the product/system, including its manufacture,
supply, installation, use, maintenance and removal
• any claims by the manufacturer relating to CE marking.
19.6 Any information relating to the manufacture, supply, installation, use, maintenance and removal of this product/
system which is contained or referred to in this Certificate is the minimum required to be met when the product/system
is manufactured, supplied, installed, used, maintained and removed. It does not purport in any way to restate the
requirements of the Health and Safety at Work etc. Act 1974, or of any other statutory, common law or other duty
which may exist at the date of issue or reissue of this Certificate; nor is conformity with such information to be taken as
satisfying the requirements of the 1974 Act or of any statutory, common law or other duty of care.
British Board of Agrément
Bucknalls Lane
Watford
Herts WD25 9BA
©2014
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tel: 01923 665300
fax: 01923 665301
e-mail: [email protected]
website: www.bbacerts.co.uk
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