Drainage and Storage Board FKD 25
Optigrün Drainage and Storage Board FKD 25 for use on extensive green roofs with single- or multi-layer construction and under path surfaces (can be walked on).
Product properties
| Material | Recycled HDPE |
| Nominal thickness | approx. 25 mm |
| Grammage | approx. 1,350 g/m² |
| Water discharge capacity (DIN EN ISO 12958) | 1.41 l/(m*s) (at 2% roof pitch) |
| Max. compressive strength unfilled | approx. 200 kN/m² |
Area of use
- As a drainage and storage board under extensive green roofs in a triple
- layer structure with filter leece FIL 105 and extensive multi layer substrate E on flat roofs up to RP 5° (= 8.8%)
- As a drainage element under thin-layer pedestrian pathways in gravel beds without compacted base layer without filter fleece directly filled with bedding material
- Also lay the FKD 25 with min. 1 row of naps overlapping and overfill with the bedding material (without zero graining, e.g. chippings 2/5) min. approx. 3 cm.
Specific properties
- 100% recycled HDPE
- CE-marked
- Drainage according to DIN 4095
- Safe and targeted guiding of excess water
- Depositing of water in the recesses
- Low weight
- Also suitable for non-pitched roofs
- Lightweight super structure with high drainage capacity
- Recyclable
- Has a European Technical Assessment (ETA-13/0557) as part of the Optigrün system solutions