Vapour Permeable Underlays

With greater demands for improved performance over recent years, use of vapour permeable underlays has become common practice in roof construction to reduce the risk of condensation.

Water vapour is created by a number of regular household activities, including bathing, cooking, washing and drying of clothing. Vapour mainly diffuses out through windows and vents, but around 20% of this vapour can leave through the ceiling and enter the roofing cavity causing a condensation risk.

The use of RoofTX® low resistance (LR), vapour permeable, air barrier underlays allows this moisture to diffuse through the membrane to the outside.

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