A vapour barrier prevents warm, humid air from inside the building being transferred into the roof layers above it. During the course of any normal day the roof space warms and cools, and these changes in temperature can cause the roof to expand and contract. Without the roof vapour barrier this could lead to moisture being trapped against the boards or joists and cause rot.
Permaroof Kent offers free roofing surveys and can check your existing vapour barrier to make sure it is in good condition or performing well. Give us a call to book your free survey in Kent and the surrounding areas.