The Product
POLYDRAIN PLP 400 is a synthetic drainage system made from expanded polystyrene. It has two sides: one flat, the other with studs.
It is recommended for flat roofs or those with a slope of < 3%. It is not recommended for use in windy areas, which make it difficult to install.
The advantages of POLYDRAIN PLP 400 :
- Provides mechanical protection for
waterproofing - Can complement thermal insulation
- High-performance drainage
- Easy to install
- Prevents asphyxiation of vegetation roots by isolating the substrate layer from possible contact with flashes of water.

Technical data
| POLYDRAIN PLP 400 | |
|---|---|
| Plate dimensions (length x width) | 120 x 70 cm |
| Plate surface | 0,84 m² |
| Thickness | 4 cm |
| Dry weight
Weight at MWC (Maximum Water Capacity) |
0.53 kg/m²
2.53 kg/m² |
| Perforation – diameter | 10 and 18 mm |
| Settlement rate | 7,9 % |
| Load-bearing floor area | 30 |
| Permissible compressive strength | > 20 kN/m² compressive strength |
| Water retention | 2 l/m² water retention |
