Vapour Permeable Roof Underlayment

Product Description:

Specifications of Vapour Permeable Roof Underlayment

vapour permeable roof underlayment, waterproofing foil, breathable membrane, vapor permeable, roof breathber

1), Introduction of Waterproof Breathable Membrane

Breathable Membrane is a water resistant membrane but with high vapour permeability, use as diffusion open roofing felts under pitched roof tile or vapour permeable barrier housewraps on timber frame walls

Breather membrane functions as a weather-resistant barrier, preventing rain from getting into the roof or wall assembly while allowing water vapor to pass to the exterior.

2), Technical data of Breathabe Membrane

Products range: 80g,90g,100g,120g,140g,160g/m2.

Roll size: 1.5m x 50m

Water resistant : Class W1

SD-value: 0.02m

Vapor permeability: >2250g/m2/24h

UV resistant: >3month

Test to EN13859-1: Pass 

3), Advantage of Breathable Membrane:

CE mark available

High quality with competitive price

Excellent tensile and nail tear strength

Good flexibility and ductility

Light weight and thin, slip-resistant surface

Simple handling and easy to use

Anti-ageing: both heat and UV stable

4), Performance of Breathable Membrane: 

Resist liquid water passing through, but allow water vapour to pass through.     

5), Structure of Breathable Membrane:

All  vapour permeable membranes are 3 layers thermal laminated: 

PP non-woven fabric + PE fuctional film + PP non-woven fabric

Spun-bonded polypropylene non-woven fabric layers for protection and reinforcement.

Micro-porous polyethylene film is the functional layer which is water-resistant but allow water vapour to pass through.