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A breathable polypropylene pitched roof underlay used to reduce wind load on slates and tiles, and to provide a secondary water-shedding layer against wind-driven rain or snow and has been designed specifically to meet the performance requirements for a pitched roof underlay.

It is manufactured by laminating a plastic film between two polypropylene fabric layers to form a breathable waterproof membrane. Combines excellent tensile strength characteristics with high puncture and nail tear resistance. It is also are resistant to UV light degradation, but is not designed to be left exposed for long periods and must be covered as soon as possible.

Standard product features


1 x 50 m or 1.5 x 50 m rolls.


0.65 mm.


Blue upper surface with anthracite underside.

Technical properties:

  • Hydrostatic head of water: 7.31 m.
  • Water vapour permeability: 1196 g/m².
  • Water vapour resistance: 0.17 MNs/g.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-65-50/323 Vapour permeable sheets

Product specification

An important note about specifying





+353 18 023333

Product reference

Monarperm 700


[Not required]
[Monarperm Monotape]

Manufacturer details

Unit 3,
Orion Business Campus,
North West Business Park,
Dublin 15
Tel +353 18 023333
Fax +353 18 036060
NBS Plus
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