Spray Foam Insulation On Roof Rafters

Moisture generated indoors or that infiltrates into the home is responsible for the bulk of the moisture in an attic insulated with spray foam on the underside of the roof sheathing.

Spray foam insulation on roof rafters.

All insulation materials require proper venting. Use closed cell foam it green for attic rafters. Heat from the house rises up to the attic but when there isn t one the heat rises up to the roof. The spray foam can also serve as the thermal and vapor control layers in both new and retrofit construction.

R value of 7 in 1 inch 97 closed cell foam. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. But spray foam insulation used at the underside of the roof deck would need to be covered by a thermal barrier and intumescent coatings are commonly used. When the choice is made to insulate along the underside of the roof deck spray foams have advantages over other insulation types because of the ability of spray foams to effectively air seal complex assemblies.

Spray foam insulation that s convenient and easy to use. Class i e 84 fire retardant meets building code spec. Rigid foam and spray foam are two of them. The movement of air into indirect conditioning of an unvented attic is a slow gradual process that will not be noticeable by occupants and typically will not put any strain on the hvac system.

Lstiburek takes blame for bad language. 100 free of cfcs vocs penta bdes urea formaldehyde. It s not coming from above the roof and it s not some new moisture source resulting from the spray foam. The best attic insulation.

Cathedral roofs especially need a lot more insulation between the ceiling and the rafters because there usually isn t any attic space. Get your kits the easy to use spray foam kit.