Drainage membrane DELTA®-X DRAIN

Economical three-layer protective and drainage membrane for installation depths up to 7 m.

DELTA®-X DRAIN can be used on pressure-sensitive surfaces, for example polymer-modified bitumen thick coatings (PMBC, formerly known as KMB).

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    DELTA®-X DRAIN in der Anwendung
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    DELTA®-X DRAIN Dränbahn in vertikaler Anwendung


  • Optimized economy for vertical applications
    DELTA®-EQ DRAIN offers an optimal nub structure for high water loads and a compressive strength that enables installation depths up to 7 m. This makes it perfect for almost all vertical applications.
  • High compressive strength
    The membrane has a high compressive strength of 250 kN/m² and so it can protect pressure-sensitive waterproofing from damage.
  • Even load distribution
    Thanks to the sliding film the contact area between the DELTA®-X DRAIN and the surface is 100%. So, the seal is optimally protected from punctiform loads from the filling material.
  • Protection against unavoidable subsidence
    Occurring subsidence in the backfilled construction pit can lead to movements of the protective and drainage membrane but do not have a major effect on the waterproofing because the sliding film is loosely connected to the sealing membrane.
  • No silting up of the knob structure
    Thanks to its special structure and its characteristic opening width of 150 μm, the laminated geotextile is extremely filter-stable and prevents the dimpled sheet from silting up.
  • Smooth overlapping
    The one-sided, approx. 10 cm wide, smooth edge, in connection with the protruding filter-stable geotextile, makes it very easy to professionally overlap the drainage membranes.
  • Conformity to standards and guidelines
    DELTA®-X DRAIN is CE-marked on base of DIN EN 13252 and meeting the requirements of DIN 4095 and DIN 18533 and the “Guideline for the planning and execution of polymer-modified bituminous thick coatings (PMBC)”.


Due to its compressive strength, the membrane can be used at an installation depth of up to 7m and with its high drainage capacity even with high water loads.

Also the usage as methane gas and radon drainage is possible.

The processing can be done either parallel or perpendicular to the top of the terrain. Always make sure that the printed geotextile points to the ground or backfill material.

The overlapping of two sheets on the long sides must be carried out by means of the one-sided smooth edge. In case of transverse joints, the lower sheet must be laid at least 20 cm under the upper sheet.

Technical data

Material Dimpled sheet made of high-density polyethylene (PE-HD) with laminated geotextile made of polypropylene as well as sliding film on the back.
Dimple height approx. 9 mm
Compressive strength approx. 250 kN/m² (EN ISO 25619-2)
Air gap approx. 7,9 l/m²
Servicetemperature range from -30 °C to + 80 °C
Tensile strength MD 13,5 kN/m, CMD 13,6 kN/m (EN ISO 10319)
Dynamic perforation resistance 40 mm (EN ISO 13433)
Characteristic opening size 150 μm (EN ISO 12956)
Water permeability 0,08 m/s (EN ISO 11058)
Water drainage capacity 3,1 l/m · s bei 20 kPa (Gradient i = 1,0) (EN ISO 12958)
Weather resistance To be covered within a term of two weeks from the date of installation (EN 12224)
Dimensions 12,5 x 2,00 m, 12,5 x 2,50 m




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Would you like information on detailed product properties, use cases or other technical topics?
Then feel free to contact our application department on +49 2330 63 578 or atabvf@doerken.de.

Do you have questions about prices, availability or the status of your order?
Our sales service will help you with these matters on +49 2330 63 636 or membranes@doerken.de.