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Bitumen resistant, thermoplastic roofing membrane with integral glass fibre reinforcement and self-adhesive layer. Due to its special formulation without additional fire proofing agents, it has a very low fire load and thus offers a very high fire protection effect. In the event of fire, the special formulation, combined with the integrated protective fleece, prevents the fire from burning through the membrane down to the thermal insulation.

WOLFIN GWSK membrane consists of the same materials as WOLFIN IB membrane, with the addition of integrated fleece reinforcement and a self-adhesive layer.


  • 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)Primary
Specification data - Polymeric membranes
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.
  • Impact resistance (to BS EN 12691): ≥ 600 N (2.3 mm thick), ≥ 750 N (2.8 mm thick).
  • 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.


Other colours are available to special order, contact manufacturer for more information.

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