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Bitumen resistant, thermoplastic roofing membrane which helps to optimize the refurbishment of bonded GWSK roof layers. The GWSK DA membranes are equipped with a self-adhesive layer which also has special drains for optimal vapour pressure equalization. The lateral spreading of the moisture and the low diffusion resistance help to speed up the drying of the roof considerably. Due to the black colour of the membrane, a high vapour pressure develops quickly when they it is exposed to the sun rays, causing the roof layers to dry out efficiently.


  • Free of toxic heavy metals and flame retarder.
  • High water permeability.
  • Highly chemical resistant.
  • Highly polymeric compound: > 94%.
  • Long proved duration (> 30 years).
  • Ozone and UV resistant.
  • Root and rhizome resistant according to FLL.

General information

Free of toxic heavy metals and flame retarder

High water permeability

Highly chemical resistant

Highly polymeric compound: > 94%

Long proved duration (> 30 years)

Ozone and UV resistant

Root and rhizome resistant according to FLL



Uniclass 2015 Polymeric membranes (Pr_25_57_51_66)
Specification data
Product Reference



2.3 mm


2.8 mm

Special order.

Standard product features





Technical properties:

  • Dimensional stability (to BS EN 1107-2): ≤ 0.5%.
  • Elongation (to BS EN 12311-2): ≥ 200%.
  • Foldability at low temperature (to BS EN 495-5): ≤ -20°C.
  • Foldability at low temperature (to BS EN 495-5): ≤ -20°C.
  • Joint sheer resistance (to BS EN 12317-2): ≥ 600 N/50 mm.
  • Nail tear strength (to BS EN 12310-1): ≥ 350 N.
  • Reaction to fire (to BS EN 13501-1): Class E.
  • Resistance to static loading (to BS EN 12730): ≥ 20 kg.
  • Tear resistance (to BS EN 12310-2): ≥ 150 N.
  • Tensile strength (to BS EN 12311-2): ≥ 10 Nmm².
  • Water vapour diffusion value (to BS EN 1931): 7500 µ (± 30%).

Product Options

Roll width:

1100 mm or 1620 mm.

Roll length:

Available in lengths of 10 m or 15 m dependent on the width.

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