RESERVE 20
Approx. 20 mm dimple height. Compressive classes of 150 and 200 kN/m²; reference water storage of 7.2 L/m².
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SNTGREEN
RESERVE
Green roof drainage and water storage sheet
RESERVE is a recycled HDPE roll sheet used as the drainage and water storage layer in green roof systems. Its formed reservoirs store water, while the voids beneath the sheet convey excess water towards the outlets. A separate filter geotextile is laid over the upper surface, combining drainage and filtration functions within the roof build-up.
- Dimple options
- 20 / 25 mm
- Reference water storage
- 7.2 / 8.5 L/m²
- Sheet material
- Recycled HDPE
Series and options
RESERVE 25
Approx. 25 mm dimple height. Compressive classes of 200, 250, 300 and 450 kN/m²; reference water storage of 8.5 L/m².
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Explore the roll, surface and layer details. Select a photograph to enlarge it.
RESERVE · Cup openings and surface texture 01 / 04
PRODUCT DATA
Technical properties
2 November 2026
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| Technical property | Method / conditions | Unit | RESERVE 20 | RESERVE 25 | ||||
|---|---|---|---|---|---|---|---|---|
| 20/150 | 20/200 | 25/200 | 25/250 | 25/300 | 25/450 | |||
| Raw material | Manufacturer declaration | - | Recycled high-density polyethylene (HDPE) | |||||
| Colour | Product description | - | Black | |||||
| Filter layer | Product configuration | - | Unlaminated; filter geotextile installed separately above. | |||||
| Dimple height | Geometrical measurement | mm | ≈20 | ≈25 | ||||
| Nominal compressive class | EN ISO 25619-2 | kN/m² | 150 (±10%) | 200 (±10%) | 200 (±10%) | 250 (±10%) | 300 (±10%) | 450 (±10%) |
| Reference water storage | Volume measurement | L/m² | 7.2 | 8.5 | ||||
| Reference roll dimensions | Dimensional measurement | m | 2 × 20 | 2 × 12.5 | ||||
| In-plane water flow | EN ISO 12958-2 i:1 20 kPa | L/(s·m) | ≈1.1 | ≈1.1 | ≈1.5 | ≈1.5 | ≈1.5 | ≈1.5 |
| Air void volume | Volume determination | L/m² | ≈12.5 | ≈16.5 | ||||
| Tensile strength MD/CMD | EN ISO 10319 | kN/m | MD 9 CMD 7 | MD 10 CMD 8 | — | — | — | — |
Applications
For green roofs, terrace gardens and planted roof areas. Selection takes account of the saturated weight of the upper layers, imposed loads, roof slope and drainage design.
Installation
Install with the reservoir openings facing upwards over a suitable protection layer. Maintain the continuity of the separate upper filter at joints and edges. Keep roof outlets and drainage paths unobstructed.
DOCUMENTS
Technical data sheets
Product information and technical table. Two-page PDF.