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In all cases
Restrain the outside edge of all installations
by an edging or G.S. Peg to prevent lateral movement.
If an edging is used, a 10mm gap should be left
between each unit to allow the release of water
from the area.
Allow for expansion
Polypropylene has a coefficient expansion of 1.2mm
per 10°C increase in product temperature per metre
- eg: A path 1x10m is installed at a product
temperature of 20°C. The product is subjected
to heat, which increases product temperature to
50°C. Therefore expansion is 1.2mm x (50°C-20°C)
= 36mm.
Do not subject grass protection surfacing to multi
axle vehicles due to the aggressive nature of
the tyres when turning.
Interlock G.S. Plates with their neighbour to
prevent lateral movement.
In grassed applications
- The area should not be trafficked until the
first cut of grass has been made as the root
system is an integral part of the system.
- When filling the cells with clean soil take
care not to overfill the cells as vehicles need
to traverse on the G.S. Plates and not on the
soil fill, otherwise compaction of the soil
will arise, thus preventing grass growth.
Stone Finish Applications
Installation is the same but the rootzone material
is replaced with 20mm layer of sharp sand.
Grass Finish
Depth of sub-base is dependent on the loads to be
imposed. All grass finished surfaces must have 100mm
depth of rootzone material underneath the plate
to sustain grass growth. Rootzone is a 40/60 mixture
of sharp sand and soil.
The sub-base material should be clean, well compacted
stone free of fines, as water must be able to pass
through the sub-base to stop the rootzone material
becoming saturated.
Stone Finish
Depth of sub-base is dependent on the loads to be
imposed. Use 20mm blinding layer of sharp sand to
enable the plates to be bedded in.
The sub-base material should be clean, well compacted
stone. To prevent flooding on the plates, the sub-base
must be free draining material. Stone chippings
should be used within the cells - minimum size of
8mm to 16mm which helps them to interlock within
the cells and prevents migration of the stone.
Pea gravel type of material should not be used as it will not interlock.
Key Points
A minimum sub-base of 250mm is required for light duty car parks - class A and B.
Heavy loading - sub-base requirements are subject
to soil type and designer's recommendations. Advice
is also available from the Naylor Technical Department.
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