Home > Companies > Triton Systems > Isola Mestertekk - Bituminous Roofing Membrane

Isola Mestertekk is suitable for almost all types of roof, including flat and sloping designs, and is used for waterproofing of new roofs and renovation of old roofs. The product is based on a versatile polyester reinforcement together with SBS-modified bitumen to produce high strength, flexibility and elasticity. The product is loose laid and mechanically fixed to the roof structure and is supplied with a thin sacrificial film in the 120 mm wide overlap, ensuring fast and safe welding with gas burner or hot air equipment.


  • Longitudinal tensile strength: 890 N/50 mm.
  • Transverse tensile strength: 720 N/50 mm.
  • Longitudinal elongation at break: 55%.
  • Transverse elongation at break: 55%.
  • Longitudinal tear strength: 80N.
  • Transverse tear strength: 95N.
  • Puncture resistance (19 mm diameter, increasing load): 930N.
  • Puncture resistance (dynamic): 10 mm diameter.
  • Longitudinal dimensional stability: -0.20%.
  • Transverse dimensional stability: +0.15%.

Fire resistance:

Class Ta/ NS Licence no 538/ appendix 4 - Test: NS-INSTA 413.


Refer to Triton technical department for recommendations.

Standard product features

Nominal dimensions and weight:

  • Roll length: 10.0 m.
  • Roll width: 1.0 m.
  • Width of overlap: 120 mm.
  • Thickness: 3.9 mm.
  • Roll weight: 46 kg.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-65-50/301 Reinforced bitumen sheets for roofing

Product specification

An important note about specifying



Triton Systems


+44 (0)1322 318830

Product reference

Isola Mestertekk


[521201 Grey]
[521214 Black]
[521224 Brick red]
[521236 Pine green]
[521241 Sapphire blue]
[521242 Alm brown]

Manufacturer details

Units 3-5,
Crayford Commercial Centre,
Greyhound Way,
Kent, DA1 4HF
Tel +44 (0)1322 318830
Fax +44 (0)1322 524017
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NBS National BIM Library