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• Features & Benefits
• Application Notes
• Limitations

Features & Benefits

• Geocomposite drainage sheet comprising a 8mm thick HDPE cuspated core bonded to a non-woven polypropylene geotextile
• Cost effective - no need for up to 500mm thick stone drainage layer behind retaining walls
• Easy site application
• Reduced environmental impact - no need for vehicular removal and transportation of spoil off site and subsequent replacing with expensive stone drainage layer
• High flow rate (water and gas)
• High impact resistant, HDPE cuspated core with a compressive strength of up to 200 kN/m² provides drainage void around structures under backfill and long term loadings
• Cost effective alternative to ‘French Drains’
• CE mark certification to EN13252:2000/A1:2005 - Geotextile related products for use in drainage systems
• Please refer to the Product Data Sheet for full details of:
  
  • Specification Clause
  • Properties
  • Application Instructions
  • Storage
  • Health and Safety

Uses

• Recommended for most building and civil engineering drainage applications
• Where directly cast concrete sub-structure walls need to be drained, may be used as a lost shuttering liner
• Can contribute to an effective waterproofing solution when constructing below ground structures such as basements, retaining walls, service ducts, lift pits and subways generally in conjunction with Type A (Barrier) and / or Type B (Integral) waterproofing systems
• Provides filtered drainage and enhanced protection when used with Proofex waterproof membranes on reservoirs, podium decks and elevated slabs
• Can be utilised in conjunction with the required ancillaries to provide a gas pressure relief pathway as part of a BS8485 compliant ground gas protection solution

Application Notes

• Fixing - Can be held temporarily in position against Type A membranes using Proofex Detail Strip prior to backfilling. If applied as a draining layer where no membrane is present, suitable mechanical fixings can be used
• Roll end joint - Pull back the geotextile fabric 50mm from one side of joint, and overlap the HDPE cores. Over lap the geotextile fabric. Geotextile should be laid in direction of flow to prevent ingress of fine material. Laps can be secured using Proofex Overtape if required
• Roll edge joints - Peel back the geotextile flap long the edge with the flat strip. Overlap the cuspated roll edge onto the corresponding flat strip of the adjacent roll. Proofex Total Tape may be used if a bonded connection is required. Overlap the peeled back geotextile flap onto the adjacent roll. This can be secured using Proofex Overtape if required
• Drainage connection - Pull back sufficient geotextile fabric to wrap around the drain. Cut back the HDPE core to an appropriate length and wrap geotextile fabric around drain
• Top closure - Pull back the geotextile fabric 60mm. Cut back the HDPE core by 50mm and wrap the geotextile fabric over the exposed end to prevent ingress of backfill. This can be secured using Proofex Overtape if required
• Backfilling must be free from any sharp objects or debris, which could damage the product. It should not contain rocks or boulders larger than 50mm. This must be placed against the product in 300mm layers compacting to 85% modified Proctor. Backfilling should be in direction of laying of strips
• Proofex Gas Vent Box and T Connector are required where the product is being utilised as part of a gas pressure relief system to achieve 0.5 points as per BS8485 Table 6
• 2.4 m x 20 m roll

Limitations

• Should not be used in areas permanently below the watertable
• Should not be used in soil containing high concentrations of iron oxides or hydroxides or in extremely fine uniformly graded silts or peat
• Resistant to chemicals found in normal soil conditions, some chemicals in certain concentrations could have an adverse effect on the drainage performance
• Should not be used in soils containing a high percentage particle sizes below the pore size of the geotextile
• For soil / ground types that are not well suited to mechanical compaction, rounded Type 1 stone should be placed between the product and the ground
• The product must not be exposed directly to UV radiation for over two months
• There are no known health hazards associated with the product in normal use
• Product weighs approximately 32kg. Each roll should be lifted by a minimum of two site operatives