NBS Source
Top Series underlays


Top Series waterproofing membranes comprise a range of glass wool and polyester reinforced polymer modified membranes. The underside of Top Series membranes is coated with Termotene film that facilitates installation and improves adherence of the membrane to the substrate to be waterproofed.

General information

Uniclass 2015

Pr_25_57_08_75 Reinforced bitumen roofing sheetsPrimary


J41/12 Built-up reinforced bitumen membrane cold deck roof covering

J41/120 Built-up reinforced bitumen membrane inverted roof covering

J41/130 Built-up reinforced bitumen membrane cold deck roof covering

J42/10 Warm deck roof covering

J42/110 Warm deck roof covering

Specification data - Reinforced bitumen roofing sheets

Product Reference

Top Series N underlay

Glass reinforced.

Top Series S underlay

Polyester reinforced.


3 mm

4 mm

Standard product features

Roll size:

10 x 1 m.



Surface finish:

  • Upper: Talc.
  • Lower: Plastics film.

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