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Drainage
Protecto-Drain 20P
Heavy duty HDPE dimpled drainage board with drainage holes – suitable for green roofing
- Suitable for extensive green roof systems including sedum roofs, wildflower and biodiverse roofs, grasses and dwarf plants, with substrates up to a depth of 200mm
- For use on structural decks which have been fully waterproofed, protected and are capable to holding the weight of a saturated green roof
- Lightweight, tough yet flexible and can be shaped around objects
- Holds water within its profile to nourish vegetation above the filtration layer (5 litres per m2)
- Does not pollute the water run off
Application
- Laid horizontally onto geotextile filtration fabric beneath, with cups facing up
- Membrane overlapped and covered with loose laid geotextile filtration layer above, separating substrate from HDPE membrane
- Growing medium / substrate is laid on top
- Provides air gap to allow free-drainage of water
- Slows run-off of water but prevents waterlogging
- Water held in reservoir cups can be drawn up back into the substrate in dry periods
- Excess water dissipates through the perforations between each cup and through the drainage channel out into the outlet
Handling
- Supplied in rolls 2 x 20m
- Easy to transport and install
- Multiple sheets can be clipped into place by overlapping the cups and sealing joints with adhesive tape
Part of a comprehensive drainage system for roll-out extensive green roof systems. Designers need to be sure that the storage capacity and drainage flow rate is sufficient for the green roof type being constructed.
It is important to remember, however, that these materials do not alone provide a drought resistant system. Irrigation in dry or hot weather and regular maintenance is required for all roof gardens and green roofs.
Storage
Protect against prolonged exposure to direct sunlight and temperatures over 25 °C
Please see our green roof pages here Green Roof Systems for more details.
Protecto-Drain 20P 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 | 5 | |
| Compression strength | 180 kN per m2 | MDV |
| Height of cups | 20mm | MDV |
| Air volume between the cups | 14 litres per m2 | MDV |
| Water drainage capacity | 10 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.