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LITHOPLAST® DREN

Studded drainage membrane for garden roof systems.

LITHOPLAST® DREN is a dimpled drainage membrane or sheet intended for application in garden roof systems, where it serves as an accumulation and drainage layer. The water is retained in the membrane studs (the perforation is out of the studs) and thus the moisture balance of the entire green roof is maintained.

LITHOPLAST® DREN in a practical manner

In the roof structure, the studded drainage membrane is placed on the final, roof waterproofing membrane including the ending inlets and accessories. Part of the green roof system is the PetexDren PE drainage mat that facilitates the drainage of excess rainwater by perforating the LITHOPLAST® DREN dimpled membrane. The geotextile placed on the drainage mat ensures the filtration of water from the soil.

See a detailed description of the green roof insulation.

LITHOPLAST® DREN can be used without anchoring in a 5-degree angle.

LITHOPLAST® DREN is produced as a roll form with stud heights of 20 mm and as a sheet form with stud heights of 40 mm, 60 mm or 80 mm.

The membrane produced by Czech manufacturer

The studded drinage membrane for roof gardens is produced in Žďár nad Sázavou, CZECH REPUBLIC. The ISO 9001 certificate testifies the good quality of our production.

In construction, LITHOPLAST® DREN is used as a part of:

  • the roof garden composition,
  • flat roofs of houses and apartment buildings,
  • terraces inside business centers and office buildings,
  • green areas above underground garages etc.

In gardening, LITHOPLAST® DREN is suitable as a bottom layer of permanent green areas.

Material HDPE (High-density polyethylene)
Volumetric weight 950 ± 50 kg/m3
Color black
Resistance against static load method B, meets requirements at 20 kg
Thermal stability -20 °C až + 70 °C
Flammability F
  20/0,8/1340 20/1,0/1340 40/1,5 60/1,6 80/2,0
Type roll sheet sheet sheet sheet
Default membrane thickness [mm] 0,8 ± 10 % 1,0 ± 10 % 1,5 ± 10 % 1,6 ± 10 % 2,0 ± 10 %
Width roll / sheet [mm] 1340 ± 2 % 1340 ± 2 % 820 ± 4 % 810 ± 4 % 8 ± 4 %
Length roll / sheet [mm] 20 ± 2,5 % 20 ± 2,5 % 1750 ± 4 % 1750 ± 4 % 1750 ± 4 %
Stud height [mm] 20 20 41 61 78
Air volume in studs [l/m2] 5 5 10,6 16,4 20,8
Air capacity of the gap [l/m2] 15 15 30,4 44,6 57,2
Compression strength [N/mm2] 0,10 0,14 0,12 0,06 0,05
Package [m2] 26,8 26,8 10x1,435 10x1,418 10x1,400
Surface density [kg/m2] 0,76 0,95 1,57 1,66 2,11
Weight of package [kg] 20 25 23 24 30

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