DELTA®-TERRAXX LIGHT: Drainage Membrane for Green Roofs and Slabs

Advantages

• Universal protection and drainage for vertical and horizontal use

  Stops seepage and runoff water building up hydrostatic pressure against the building. One product for many applications.

• Drainage far above a mineral layer

  The 10 mm dimpled sheet outperforms a 20 to 30 cm mineral drainage layer and protects against frost damage.

• Tested soil durability of at least 100 years

  Tested to EN 12447, EN ISO 13438 and EN 13249; presumed durability in natural soil (pH 4-9, < 25 °C) at least 100 years.

• Fast on large areas, easy detailing

  12.5 x 2.40 m rolls lay 30 m² in one step; cut with a knife around penetrations, edges and posts.

• Impact sound reduction up to 32 dB

  Tests based on DIN EN ISO 10140 at RheinMain University confirm 26 to 32 dB depending on the build-up.

• Integrated self-adhesive edge

  Quick joining of strips, keeps gravel and soil out, improves water, vapour and radon tightness, and keeps the mat stable under wheeled site vehicles.

• Even load distribution

  About 80% contact with the substrate.

• Anti-clogging geotextile

  Prevents clogging by fine clay or silt particles.

• Fatigue tested

  Passed 400,000 cycles at ANTEA laboratory, Orléans (report Lab21013, 01/12/2021), with less than 10% deformation.

• Radon gas barrier

  Under floor slabs it also acts as a radon barrier, a 2-in-1 product.

Product Data

Dimpled sheet material

Silver HDPE (virgin polymers)

Geotextile material

Polypropylene, heat-welded to the dimples

Chemical properties

Safe for drinking water, resistant to chemicals, bacteria and alkalis, root-resistant

Dimple height

approx. 10 mm

Weight

approx. 570 g/m²

Compressive strength (short term)

approx. 250 kN/m² (0.25 N/mm²) [EN 25619-2], approx. 25 tonnes

Compressive strength (permanent load)

approx. 70 kN/m² (0.07 N/mm²) [EN 25619-1], approx. 7 tonnes

Compressive creep 1,000 hours

< 4% (under 100 kPa)

Fatigue test (ANTEA)

passed (400,000 cycles at 120 kN/m²)

Dimples per m²

approx. 2,500

Contact area

approx. 8,000 cm²/m²

Drainage capacity in the plane (EN ISO 12958)

3.09 l/m·s at 20 kPa (i = 1.0); 0.36 l/m·s at 20 kPa (i = 0.02); 0.88 l/m·s at 20 kPa (i = 0.1)

Air volume between dimples

approx. 7.9 l/m²

Maximum installation depth (vertical wall)

3 m

Presumed durability in natural soil (pH 4-9, < 25 °C)

100 years (EN 13438)

Sound insulation

up to 32 dB

Radon gas tight

yes

Roll dimensions

12.50 m x 2.40 m (15 rolls per pallet)

Values are typical. Check the current Dörken data sheet before specifying.

Frequently Asked Questions