ProtectaWeb tree root protection installation guide

ProtectaWeb Tree Root Protection System is available in 4 different depths for various traffic loadings. Each site should have a detailed design to ensure the correct product depth is used.

However, unless the existing ground conditions contain very weak soils and have a low CBR the following can apply:

The guide below is based on soils with a CBR of 3 or above

• 75mm - For pedestrians and cycleways
• 100mm - For cars, 4-wheel drive vehicles, vans, etc. up to 6 tons.
• 150mm - For access roads to be used by light construction traffic.
• 200mm - For loaded HGV's delivering construction materials, cranes, pilling rigs

Material list

• ProtectaWeb 3-Dimensional Cellular Confinement System
• MultiTrack SNW 40 UV minimum separation and protection fleece
• MultiTrack 1000 minimum separation geotextile
• Steel 700mm staking pins
• Stapler and Staples/heavy cable ties
• 4/20mm or 40/20mm clean Angular Stone to BS EN 13242 and 12620
• Finish porous surfacing materials are preferable

• Remove surface vegetation to treat with suitable herbicide to level under the supervision of the project Arboriculturist.
• Fill any hollows that may be in the exposed ground with no fines 4/20mm clean angular stone.
• Place MultiTrack SNW 40 UV Geotextile over the area to be protected ensuring laps with a minimum of 300mm.
• Mark out the area to be protected with edging detail, for example, timber boards.

• Roll out MultiTrack SNW 40 UV Geotextile to cover the area to be protected.
• Insert 4 equally spaced steel pins along the width of the panel.
• Expand the panel over the MultiTrack SNW 40 UV and the pins, extend to the required length and then pin across the opposite panel end.
• Pin along the length of the panel on each side.
• If full panels are not being used, ensure the cells have been expanded to their full dimension.
• Staple or cable tie any adjacent panels together.

Note: ProtectaWeb panels can be cut to shape if required with a heavy-duty Stanley Knife.

Using 4/20mm or 40/20mm clean angular stone to BS EN 13242 and 12620 (depending on the cell depth being used).

• Fill the cells of the ProtectaWeb with a 4/20mm or 40/20mm clean angular stone.
• Allow 25mm overfill for any settlement of the stone into the cells.
• If the area is to be trafficked immediately, slightly increase the amount of surcharge overfill to a maximum of 50mm over the ProtectaWeb with 4/20mm or 40/20mm clean angular stone.

The ProtectaWeb TRP system can be surfaced with the materials listed below:

FINISH 1 - BLOCK PAVING

• Place MultiTrack 1000 separation fabric over the filled ProtectWeb
• Lay sand/gravel bedding material as per to manufacturer's recommendations
• Place porous/standard blocks as per the manufacturer's instructions

FINISH 2 - POROUS AND STANDARD ASPHALT

• Slightly surcharge the ProtectaWeb with 25mm of 4/20mm or 40/20mm clean angular stone
• Place hot Asphalt as per to manufacturer's instructions

FINISH 3 - RESIN BOUND GRAVEL

• Place MultiTrack SNW 17 separation fabric over the filled ProtectaWeb
• Lay Asphalt carpet and resin-bound gravel to the required thickness and as per the manufacturer's instructions

FINISH 4 - LOOSE GRAVEL

• Option 1- Slightly overfill the ProtectaWeb with the clean angular stone
• Option 2 - Place a 25mm thick decorative stone on top of the filled ProtectaWeb

FINISH 5 - CELLTRACK GRAVEL RETENTION SYSTEM

• Place MultiTrack 1000 separation geotextile over the filled ProtectaWeb
• 20mm bedding layer of 5mm single-sized stone and lightly tamp
• Lay CellTrack porous pavers and fill with a 6-10mm decorative stone

FINISH 6 - CELLTRACK GRASS PROTECTION SYSTEM

• Place MultiTrack 1000 separation geotextile over the filled ProtectaWeb
• 70mm of Rootzone bedding layer (60% sand/40% soil) and lightly tamp
• Lay CellTrack porous pavers and fill with Rootzone mix, seed accordingly (please allow 4-6 weeks for the seed to germinate before trafficking)

FINISH 7 - TRIAL-FLEX

• Place MultiTrack 1000 separation geotextile over the area for pedestrian protection
• Roll over E'GRID on top of the Geotextile (strength-based per application)
• Cover to a depth of 50mm of TrialFlex porous flexible resin bound finish.

FINISH 8 - CONCRETE

• Place MultiTrack 1000 separation Geotextile over the filled ProtectaWeb
• Cast the concrete slab over the Geotextile