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DELTA®-FLORAXX - Garden Roof Applications

DELTA®-FLORAXX - Garden Roof Applications

DELTA®-FLORAXX DELTA®-FLORAXX provides a high water retention capacity combined with outstanding drainage characteristics, and is an ideal and sustainable component in garden roof designs.


DELTA®-FLORAXX is a perforated drainage board specifically designed for use in garden roof assemblies. The product features large, 20 mm high dimples with and octagon shape for outstanding compressive strength. Due to its high water retention capacity and its ability to effectively drain away surplus water this special membrane is ideal for use in extensive or intensive rooftop gardens.
DELTA®-FLORAXX is made from 60% recycled HDPE and 40% virgin HDPE.


Studded membrane made of special, high-density polyethylene. Drains surplus water effectively through large perforations between the 20 mm high octagon-shape dimples. This environmentally friendly product is rot-proof in contact with soil.


DELTA®-FLORAXX retains rainwater in its high capacity dimples - an important safety factor for the plants on any garden roof. Any surplus-water can effectively drain away through the perforations and the open channel system under the dimple sheet.

DELTA®-FLORAXX is easily installed on top of a root-proof waterproofing system.

Technical Data

Product name
Dimple height 0.79 in  (20 mm) ASTM D6364-06
Compressive strength
4,160 psf  (200 kN/m²) ASTM D6364-06
Water retention capacity
21.98 fl. oz / ft²  (7 l/m²)
Drain capacity between dimples (Flow rate @ Hydr. grad. 0.1; 5 kPa)
13 gal/min/ft   (161 l/min/m)
ASTM D4716-08
Drain capacity between dimples (Flow rate @ Hydr. grad. 0.02; 5 kPa)
5.7 gal/min/ft   (71 l/min/m)
ASTM D4716-08
Drainage rate through perforations
3.86 fl. oz / ft²  (1.23 l/s x m²)
Volume of air between dimples
43.98 fl. oz / ft²  (14 l/m²)
Chemical properties Resistant to chemicals
Root-penetration resistant
Does not rot when in contact with soil

Non-toxic, non-polluting

Temperature resistance -22°F to +176°F  (-30°C to +80°C)
Roll dimensions
6.6' x 65.6' (2 x 20 m)

Service life expectancy
> 25 years (at pH between 4 and 9 and temperature below 77°F / 25°C). Do not  expose to UV light for longer than 30 days.

DELTA® is a registered trademark of Ewald Dörken AG, Herdecke, Germany.


Incorporate DELTA Products into your plans quickly and easily by downloading our design files from