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Cosmofin FM

A polyester reinforced membrane designed specifically for use within mechanically fixed roofing applications and as a detailing membrane for upstands. The non-wick polyester fabric gives the membrane inherent tensile strength which is required to facilitate the use of steel fasteners to restrain the system against wind uplift. Mechanically fixed systems can be cost effective solutions, and are ideal where lightweight constructions are considered. Conforms to BS EN 13956, CE marked.

General information


Uniclass 2015
Pr_25_57_51_66 Polymeric membranesPrimary

J42/10 Warm deck roof covering

J42/400 Waterproof membrane

Specification data - Polymeric membranes
Product Reference

Cosmofin FM


1.2 mm

1.5 mm

1.8 mm



Light grey

Standard product features



Technical properties:

  • Dimensional stability (to BS EN 1107-2): ≤ 0.5%.
  • Elongation (to BS EN 12311-2 (A)): ≥ 15%.
  • External fire performance (to ENV1187 and BS EN 13501-5): Broof t1.
  • Foldability at low temperature (to BS EN 495-5): ≤ -30°C.
  • Hail resistance (to BS EN 13583): ≥ 17 m/s.
  • Joint peel resistance (to BS EN 12316-2): ≥ 185 N/50 mm.
  • Reaction to fire (to BS EN 13501-1): Class E.
  • Resistance to impact (to BS EN 12691 (A / B)): ≥ 500 mm.
  • Tear resistance (to BS EN 12310-2): ≥ 200 N.
  • Tensile strength (to BS EN 12311-2 (A)): ≥ 1050 N/50 mm.
  • UV exposure (to BS EN 1297): Pass.
  • Water vapour diffusion value (to BS EN 1931): 10 000 µ (± 30%).

Product Options

Roll size:

1.2 mm x 1.5 m x 20 m, 1.5 mm x 1.5 m x 15 m or , 1.8 mm x 1.5 m x 15 m.


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

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