Warm Roof Construction Vapour Barrier

High pressure moves to low pressure.

Warm roof construction vapour barrier.

Hot moves to cold. It is frightening indeed that construction practices can be so dramatically. Vapor barriers are sheets of plastic or other material placed on one side of insulation sheets. The insulation and vapour barrier can be mechanically.

Reduce heat loss and boost energy efficiency with market leading vapour control layers vapour barrier membrane and vapour control barriers. What it means in terms of building and roofing science is this. This helps explain why warm moist interior air e g 75º f 50 percent relative humidity infiltrates up into a roof system when there is no air barrier. To use epdm for a warm deck flat roof construction solid closed cell roof insulation such as kingspan or celotex should be placed on top of the roof deck rather than in between the rafters.

A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. We re proud to bring you a range of choice from novia s excellent dual use foil tape to powerlon s ultrablock air barrier and plenty more besides. A vapour barrier will then need to be installed to reduce condensation in the roof structure. Whether or not you need a vapor retarder hinges on three main factors your climate your home and the location of the wall you re insulating.

To know if you need a vapor retarder ask yourself a few basic questions. Moist moves to dry. In any case the vapor barrier must point to the warm side. You ll find pitched roofing products here.

Vapor barriers are also a cold climate artifact that have diffused into other climates more from ignorance than need. The history of cold climate vapor barriers itself is a story based more on personalities than physics. Rose 1997 regales readers of this history. Our warm roof construction no ventilation consists of 100mm joists 18mm plywood breathable membrane 50mm celotex insulation battens and slate roofing.