Drainage Material Perl 2-10 BT
Optigrün Drainage Material Perl 2/10 BT is used as an especially lightweight drainage layer beneath extensive and intensive green roofs and for pressure resistant filling of Drainage Boards on roof structures with low load reserves.
| Material | Expanded clay |
| Grading | 2 - 10 mm |
| Frost resistant | DIN 4226 |
| Salt content | < 1.5 g/l |
| Max. water capacity | 21 - 30 Vol% |
| Water permeability | > 450 mm/min |
| Weight dry | min. 360 kg/m³ |
| Weight when saturated | max. 680 kg/m³ |
