NewSeal 420 DeckDrain – Advanced Drainage & Water-Retention Membrane for Green Roofs
NewSeal 420 DeckDrain is a high-performance drainage and water-retention membrane, designed for extensive green roofs featuring sedum, moss, herbaceous plants, or grass. Its unique bonded geotextile ensures maximum water retention while preventing soil intrusion into the water-holding cups, providing a larger and more effective water reservoir than other 20mm-deep membranes.
When the reservoir is full, the large drainage holes allow excess water to flow freely, preventing saturation and waterlogging.
Key Benefits:
✔ Superior Water Retention – Maintains a larger water reservoir than conventional membranes.
✔ Prevents Geotextile Sagging – Unique bonded geotextile prevents soil intrusion into water-holding cups.
✔ Fast Drainage Flow – Large drainage holes prevent waterlogging and allow for efficient runoff.
✔ Highly Durable & Resilient – Tough HDPE core withstands heavy loads.
✔ Enhanced Soil Filtration – Geotextile layer filters out suspended soil particles (fines).
✔ Easy & Quick Installation – Lightweight, flexible, and designed for efficient laying.
Typical Applications:
✔ Extensive Green Roofs – Ideal for shallow planting above decks, flat roofs, or pitched roofs.
✔ Drainage & Water Management – Ensures controlled water retention while allowing excess flow.
✔ Sustainable Building Solutions – Supports eco-friendly roofing systems.
Suitable Substrate:
✔ Directly above the primary deck or roof waterproofing membrane.
Product Data:
| Code |
Packaging |
Colour |
Area |
| M31 |
Roll: 50m x 0.92m |
Black |
46m² |
Technical Performance:
| Feature |
Result |
| Water Flow at 20 kPa (1:80 slope) |
0.07 l/m/s |
| Water Flow at 100 kPa (1:80 slope) |
0.04 l/m/s |
| Water Flow at 200 kPa (1:80 slope) |
0.02 l/m/s |
| Temporary Load Compressive Strength |
>240 kPa |
| Permanent Load Compressive Strength |
>120 kPa |
| Water Vapour Diffusion Resistance – Sd Value |
>604m |
| CBR Puncture Resistance |
2800.00 N |
| Tensile Strength (Machine Direction) |
19 kN/m² |
| Tensile Strength (Cross Direction) |
10 kN/m² |
| Chemical & Oxidation Resistance |
Excellent |
📞 For expert guidance or bulk pricing, call us at 01268 472358.
