It is a lightweight, flexible membrane made from HDPE (high density polyethylene). When installed over waterproofing membranes, it protects the membrane from abrasion or puncture damage caused by backfilling, settlement and ground salts. It has high tearing and impact resistance, and is completely rot –proof, and unlike many bitumen based protection membranes will not become damaged by roots over time.
The 8mm deep cups provide an air gap between the concrete structure and the backfill, which prevents hydrostatic pressure building up and helps to ventilate the wall. The water simply runs down the outer surface towards a drain at the bottom of the structure – such as a perforated pipe wrapped on the under side by the Protecto-drain 8.
Fixing is easy. Each sheet can be bonded to the structural wall using bitumen based adhesive tape (as shown in video 1 above) or fixed with nails and plugs. Each sheet should overlap the other by at least 20cm. The standard membrane is 0.6mm thick, but heavier duty and lightweight varieties are also available. It is supplied on a roll 2 x 20m.
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The nails pass through the membrane easily without splitting the material, and the plug helps to seal the cup. A cover profile should be fitted to the top of the area to prevent particles dropping behind the membrane.
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Installation is a job easily carried out by one man on site.
Wallbarn Protecto-drain 8 can also be fitted to floors to act as a vapour barrier and damp proof layer on a horizontal plane. It has been used successfully in landfills and beneath concrete layers.
Technical Data
| Technical features | Technical data | Test Method |
| Material | High density polyethylene (HDPE) | |
| Roll width | 2 metres | calibrated measuring tape |
| Roll length | 20 metres | calibrated measuring tape |
| Roll weight | 550 gsm (±10%) | calibrated thickness measuring tape |
| Rolls per pallet | 12 | |
| Compression strength | 250 kN per m2 | MDV |
| Height of cups | 8mm | MDV |
| Number of cups | 1500 pieces per m2 | MDV |
| Air volume between the cups | 5.5 litres per m2 | MDV |
| Water drainage capacity | 4.6 litres per m2 | MDV |
| Temperature tolerance | - 30°C to + 80°C | MDV |
| Reaction to fire | B2 (B1 available by special request) | DIN 4102 |
| Physical characteristics | Rot-proof, resistant to fungus and bacteria. Will not leach chemicals. Not harmful to drinking water. No health hazards under normal use | |
Application
Used as a mechanical protection against soil and root movement along foundation walls. It can be installed with a 20cm overlap and fixed with nails and sealing buttons 5 cm from the top edges of the roll and 20cm from each roll. Edging profile is installed to prevent soil ingress into the cavity. Maximum build-up 8 metres high.
Laid horizontally and fixed using sealing tape in the overlapping areas the sheets protect concrete flooring form rising damp and keep reinforcement mesh in place firmly during the concrete works.
Storage and handling
Protect against prolonged exposure to direct sunlight and temperatures over 25 °C
Guarantee / warranty
When used in the correct manner and application, the material will be rot proof for 20 years. Wallbarn application rules and proper site storage, handling and installation practices must be carried out as a prerequisite for any possible future warranty claims.
Health and safety
No known dangerous substances
This datasheet represents the current knowledge of the product, but may be revised by Wallbarn in the future. It is the duty of the customer and installer to be clear that this product is suitable for the purposes it is used for.
This technical datasheet may be revised or changed at any time without prior notice. It is the duty of the customer and installer to be sure they possess the latest version of the datasheet.
To download our current brochure (in Adobe Acrobat PDF format) please click here.
Wallbarn Protecto-drain is high density polyethylene (HDPE) cupped drainage sheeting which acts as a protection and drainage layer for waterproofed surfaces.