Home
My Wrekin
Geosynthetic being installed on construction site

ProtectaWeb tree root protection installation guide

Introduction

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

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

  • Footpath System- Geogrid and Geotextile combination with Asphalt/Resin- for Pedestrains and Cycleways, no vehicular traffic.
  • 75mm- For Pedestrians Cycleways and Vehicles up to 1.5 tons.
  • 100mm- For Cars, 4-wheel drives, vans etc up to 6 tons.
  • 150mm- For Fire engines, removal vehicles and dust carts up to 20-30 tons.
  • 200mm- For construction vehicles, cranes etc 40 tons and all above.

No Dig System - Material List

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

Ground preparation

  • 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.

Installation of ProtectaWeb Tree Root Protection

  • 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.

Filling ProtectaWeb

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.

Finishing surfacing details

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

Related pages

Related products

Stock code Description My Wrekin
Protectaweb/100 100mm deep geocell
Protectaweb/150 150mm deep geocell
Protectaweb/200 200mm deep geocell
Protectaweb/75 75mm deep geocell