Breathable Roofing Felt Condensation

3 3 however in the context of this article a breathable roofing membrane is a material which in service conditions is sufficiently permeable to water vapour transfer to adequately limit the risk of condensation in roofs.

Breathable roofing felt condensation.

Breathable roofing felts must be durable breathable strong flexible and waterproof. Breathable membranes are water resistant as well as resistant to snow and dust but air permeable. Breathable roofing felt is completely waterproof. Older homes tend to have a degree of natural ventilation due to less accurate building methods therefore offering more opportunity for moisture to escape.

How does breathable membrane work. You would usually use them within external wall and roof structures in which the exterior cladding may not be completely water tight or moisture resistant such as in tiled roofs or framed wall constructions. In the end the roof space becomes colder than before and eventually promotes condensation. It is also guaranteed to last the lifetime of your roof prevent condensation and allow air to circulate.

This is particularly because the use of thick layers of thermal insulation in roofs leads to reduced temperatures in the roof space. It is often linked to older style impermeable roofing felt which has been around since the 1930s although breathable membranes which were introduced in the 1980s are not immune in some circumstances. Such cookers often allow for the quick rise of moist air leaving behind the cold air. Another leading cause of condensation in roofs is the use of wood burner cookers.

You have a cold spot in the roof space where moisture is trapped if you havent got a breathable roofing felt on the roof there are options that can reduce the condensation the cheapest way is to install either slate or tile vents or ridge vents buy this is more expensive and having the insulation between the rafters will also be of better use to you. In these circumstances the rafters in contact with the felt may remain damp most of the time causing the surface of the rafter to become stained and in the worst case rotten. 3 4 the function of these membranes is to provide all of the normal demands made on a. Condensation occurs in roof spaces when there is either too much warm air circulating upwards from living spaces or when there is inadequate roofing ventilation.