Netpave® 50 Netpave® 25

Netpave
®
Technical Specification & Installation Guide
Netpave is an ideal, durable porous paving system,
compliant to the new permeable paving regulations,
offering an 85% void for excellent water permeation.
Netpave is a market leading product, which is made
from 100% recycled material.
What makes Netpave unique, against its competitors,
is the ‘spring like’ elements within the grid, giving it
flexibility both horizontally and vertically.
The Netpave system offers two types of paving
solutions, which can be trafficked.
®
Netpave 50
Netpave 50 provides an attractive, easy to use,
durable solution for the provision of car parks,
pathways and access routes.
For a successful installation, the site needs to be
excavated and a suitable sub base installed, as
described on page two.
Netpave 50 units are simply connected by lugs and
slots. The flexibility of Netpave 50 means they can
be laid on undulating surfaces and gradients, without
fear of fracture or separation.
Netpave 50 can be filled with gravel or loam for grass
seeding into.
The Netpave once filled with gravel will confine the
infill material within its cells, to prevent rutting and
gravel migration.
By filling Netpave with loam and seeding with grass,
you can maintain or create a green area, which can
safely be used to park on.
Use Netpave 50 as a solution on a Sustainable Urban
Drainage Systems (SUDS) project.
®
Netpave 25
Netpave 25 offers all of the benefits of Netpave
50, but provides an instant solution to parking on
existing grassed areas.
Simply lay Netpave 25 on top of the grassed
area, connect together and it can be driven on
immediately. Netpave 25 will improve vehicle traction
on the grass and prevent rutting.
No excavation is required to apply Netpave 25 in this
way.
After two to three months of a grass growing season,
Netpave 25 is almost invisible.
It is ideal for paths, parking applications and other
trafficked applications where regular wear would
soon cause erosion and damage to the grass.
Although designed for permanent usage, it can be
laid temporarily and removed if only required for short
periods of time.
Netlon Netpave 25 and Netpave 50
1
®
Netpave 50
Benefits
Technical data
• HGV load bearing capability
• Resists deformation and fracture
Paver size: 500 x 500 x 50mm cell
height (4 per square metre)
• Easy installation with no pegging
Weight: 8.5 kg per m2
• Conforms to irregular surfaces and
gradients
Load bearing: 150 tonnes per m2
• Netpave 50 complies with
BS8300:2009
• Provides ideal source control for
Sustainable Urban Drainage Systems
(SUDS)
Material: 100% recycled polyethylene
Applications
•
•
•
•
Permanent and overspill car parks
Drives, paths and cycle routes
Fire and service access roads
Helipads
Netpave 50 installation guidelines for GRAVEL surfaces
1. Place paver units with dimpled face uppermost
(flared base down) onto the prepared sub base and
bedding layer (see note 4). The leading edge of the
pavers should have the fixing lugs exposed for quick
installation. No pegging is required. Edging boards or
kerbs are recommended, to aid gravel retention.
2. Connect the pavers using the lugs and slots,
progressing over the area in rows. Use protective
gloves to avoid abrasions.
3. Pavers can be cut using a hand or power saw to fit
around obstructions and contours. Cut pieces which
are less than half the original size should be avoided
where possible.
4. Fill the pavers to the top of the cells with the
specified crushed aggregate. If required, use a light
vibrating plate to consolidate the crushed aggregate
into the cells. Top up cells with crushed aggregate
as necessary. Fully rounded pea gravel is not
recommended.
Paver type
Specifications
Netpave 50
Material
Paver unit size
Nominal cell size
Weight
Load bearing capacity
Flexure
Connection type
Colour
Markers
5. If the area is to be used as horse paddock, cover
the area with a 50-100mm thick layer of fine sand/
mulch.
6. The surface may be trafficked immediately.
Note 1: If TDP SN20 geogrid is omitted, then the total
sub base layer thickness must be increased by
a minimum 50%.
Note 2: Typical drainage details; 100mm diameter
perforated pipe drain laid at minimum gradient
1:100, bedded on gravel in trench backfilled with
‘DoT Type A’ drainage stone, covered or wrapped
with a geotextile fabric and leading to a suitable
outfall or soakaway. Drains placed down centre
or one edge of access routes up to 5m wide.
Wider areas may require additional drains at
5m - 10m centres. Drainage design by specifier
based on specific ground conditions on site.
Note 3: A ‘DoT Type 1’ sub base may be used,
provided that an adequate drainage system is
installed, or alternatively a porous/open-graded
(reduced fines) sub base layer, e.g. as part of
a Sustainable Urban Drainage System (SUDS)
application. If a reduced fines sub base layer
is specified, this must be covered with either
a geotextile filter membrane and/or suitable
clean gravel binding layer, to avoid fine particles
entering the sub base layer.
Note 4: Maximum advised gradient for traffic
applications is 12% (1:8) 7˚.
2
100% recycled polyethylene
500mm x 500mm x 50mm (4 per m2, pre-connected)
63mm x 63mm (internal) Approx 85% open cells/m2
8.5kg/m2
150 tonne/m2 (crush resistance)
Individual pavers capable of articulating about central axes.
‘T’ lugs and slots.
Black
White mouldings are available to identify areas such as parking bays
and routes. These square inserts clip into the top of paver cells.
12 per continuous linear metre.
Chemical resistance
Excellent
UV resistance
High
4 – 14mm crushed aggregate (BS EN 13242)
20 – 25mm thick bedding layer
4 – 14mm crushed aggregate (BS EN 13242)
To top of paver cells
DoT Type 1 or
‘D’ thickness in mm (see Table 2 & Note 3)
a porous sub base
Bedding layer
Paver fill
Sub-base type
Sub-base reinforcement
TDP SN20 geogrid (see Note 1 & Table 2)
Table 1: Field guidance for estimating sub-grade strengths
Indicator
Consistency
Tactile
(feel)
Strength
Visual
(observation)
Very soft
Hand sample squeezes through fingers Man standing will sink >75mm
Soft
Easily moulded by finger pressure
Man walking sinks 50 – 70mm
Medium
Moulded by moderate finger pressure
Firm
Moulded by strong finger pressure
Stiff
Cannot be moulded but can be
indented by thumb
Mechanical
(test)
CBR
CU
SPT
%
kN/m2
<2
<1
<25
2–4
Around 1
Around 25
Man walking sinks 25mm
4–8
1–2
25 – 40
Utility truck ruts 10 – 25mm
8 – 15
2–4
40 – 75
Loaded construction vehicle
ruts by 25mm
15 – 30
4–6
75 – 150
Netlon Netpave 25 and Netpave 50
Netpave 50 installation guidelines for GRASSED surfaces
1. Place paver units with dimpled face uppermost (flared
base down) onto the prepared, well consolidated
bedding layer (see note 5). The leading edge of
the pavers should have the fixing lugs exposed for
quick and easy installation. No pegging is required.
Edging boards or kerbs can be used where required,
according to local soil conditions.
2. Connect the pavers using the lugs and slots,
progressing over the area in rows. Use protective
gloves to avoid abrasions. Leave a 10mm gap around
the edge to allow for expansion.
3. Pavers can be cut using a hand or power saw to fit
around obstructions and contours. Cut pieces which
are less than half the original size should be avoided
where possible.
4. Fill the pavers with the specified propriety rootzone.
Finished levels should be 7-10mm below the top of
the cells after settlement. Do not overfill the paver
cells. A light vibrating plate can be used to consolidate
the pavers and to settle the rootzone infill if required.
5. Rootzone must be a free-draining structurally sound
sand:compost or sand:soil blend. This is a nominal
proprietary blend of 60:40 or 70:30 ratio. Self
blending is not recommended.
Paver type
Specifications
6. Carry out a normal seeding, fertilising and watering
programme. A very light top dressing may be applied
to just cover the seed and to provide adequate
germination conditions. DO NOT OVERFILL.
7. The area cannot be trafficked until the grass has fully
established, typically 8 weeks during the growing
season.
Netpave 50
Material
100% recycled polyethylene
Paver unit size
500mm x 500mm x 50mm (4 per m2, pre-connected)
Nominal cell size
63mm x 63mm (internal) Approx 85% open cells/m2
Weight
9kg/m2
Load bearing capacity
150 tonne/m2 (crush resistance)
Flexure
Individual pavers capable of articulating about central axes.
Connection type
‘T’ lugs and slots.
Colour
Black
Note 1: If TDP SN20 geogrid is omitted, then the total
sub base layer thickness must be increased by a
minimum 50%.
Markers
White mouldings are available to identify areas such as parking bays
and routes. These square inserts clip into the top of paver cells.
12 per continuous linear metre.
Note 2: Typical drainage details; 100mm diameter
perforated pipe drain laid at minimum gradient
1:100, bedded on gravel in trench backfilled with
‘DoT Type A’ drainage stone, covered or wrapped
with a geotextile fabric and leading to a suitable
outfall or soakaway. Drains placed down centre
or one edge of access routes up to 5m wide.
Wider areas may require additional drains at
5m - 10m centres. Drainage design by specifier
based on specific ground conditions on site.
Chemical resistance
Excellent
UV resistance
High
Note 3: A ‘DoT Type 1’ sub base may be used,
provided that an adequate drainage system is
installed, or alternatively a porous/open-graded
(reduced fines) sub base layer, e.g. as part of
a Sustainable Urban Drainage System (SUDS)
application. If a reduced fines sub base layer
is specified, this must be covered with either
a geotextile filter membrane and/or suitable
clean gravel binding layer, to avoid fine particles
entering the sub base layer.
Note 4: Rootzone bedding and paver fill must be a
free-draining, structurally sound proprietary
blend of sand:soil or sand:compost such as that
used in sports/golf construction. This is normally
identified as a 60:40 or 70:30 ratio blend and
in-situ self-blending is NOT recommended.
Note 5: Maximum advised gradient
for traffic applications is 12% (1:8) 7˚.
Netlon Netpave 25 and Netpave 50
Bedding layer
60:40 rootzone (see Note 4)
50 – 70mm thick bedding layer
Paver fill (seed bed)
60:40 rootzone (see Note 4)
40mm thick layer
Grass seed
35g/m2 amenity blend low maintenance seed.
Fertiliser
Pre-seeding fertiliser mix followed up with appropriate spring or autumn fertiliser.
Sub-base type
DoT Type 1 or
a porous sub base
Sub-base reinforcement
‘D’ thickness in mm (see Table 2 & Note 3)
TDP SN20 geogrid (see Note 1 & Table 2)
Table 2: Typical Sub-base Thickness (D) Requirements
Application/Load
CBR (%) strength
of subgrade soil
(see Table 1)
(D) DoT sub-base
thickness (mm)
(see Note 3)
TDP SN20 Geogrid
(see Note 1)
Fire truck and
occasional HGV
access
>6
4-6
2-4
1-2
125
175
275
475
SN20
SN20
SN20
SN20
Light vehicle access
and overspill car
parking
>6
4-6
2-4
1-2
100
150
225
350
SN20
SN20
SN20
SN20
3
®
Netpave 25
Benefits
• Applied onto the top of existing grassed surfaces
• Able to support light traffic on firm ground and improve
traction
• Resists deformation and fracture
• Quick and easy installation with no excavation or pegging
• Conforms to irregular surfaces and gradients
Technical data
Paver size: 500 x 500 x 25mm cell height (4 per square metre)
Ref: 22535 Date: 08.13
Weight: 4.5 kg per m2
Load bearing capability: Light vehicles and pedestrians only
(according to soil strength)
Material: 100% recycled polyethylene
Applications
• Overspill car parks
• Drives, paths and cycle routes
• Other occasional use grassed areas
Netpave 25 will help provide protection to grassed surfaces from
light traffic. However, it will not compensate for weak ground
conditions where more structural solutions are necessary.
To determine whether Netpave 25 might be appropriate for your
application, try a simple test, by driving a vehicle onto the area.
If no significant rutting occurs after a period of heavy rain, then
Netpave 25 should be suitable.
Netpave 25 installation
Installation of a land drainage system prior to laying Netpave
25 may help to improve accessibility to the site. If pedestrian
traffic is expected with high heels etc., then consideration
should be given to appropriate warnings of potential tripping
hazard.
1. Cut the existing grass as short as possible. Ensure the
surface is reasonably level, fill local depressions with a
blend of sharp sand and topsoil to firm the surface.
2. Place Netpave 25 with flared base onto the ground. Start
with one edge and with the lugs all facing in the direction
of laying. Lay down one edge, then work towards the
opposite side.
3. Netpave 25 can be cut with a suitable saw to work round
trees, edges and other obstacles. Exposed edges may be
pegged, or buried below adjacent turf if required.
4. The area can be used immediately after laying, but will
improve if the grass is given some time to further establish.
After establishment, Netpave 25 can be almost invisible to
the user.
5. Mower blades should be set high for the first 2 – 3 cuts.
Application of fertilisers and turf maintenance products can
be carried out as required.
Geotextile Fabrics & SN20 Geogrid
Are also available from TDP to complete your Netpave installation.
TDP Limited, Derby Road, Wirksworth, Derbyshire DE4 4BG
Tel: 01629 820011 Fax: 01629 820022 e-mail: info@tdpltd.com
Website: www.tdpltd.com