Water vapour is created by several regular household activities, including bathing, cooking, washing and drying clothing. Vapour mainly diffuses through windows and vents, but around 20% 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. Our Roofshield® product offers vapour and air permeability with a meagre vapour resistance.