Spray Foam Insulation On Roof Rafters

Because spray foam insulation applied to the underside of roof sheathing inhibits heat conduction.

Spray foam insulation on roof rafters.

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. All insulation materials require proper venting. 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. Class i e 84 fire retardant meets building code spec.

Use closed cell foam it green for attic rafters. Get your kits the easy to use spray foam kit. The spray foam can also serve as the thermal and vapor control layers in both new and retrofit construction. Rigid foam and spray foam are two of them.

Lstiburek takes blame for bad language. The best attic insulation. 100 free of cfcs vocs penta bdes urea formaldehyde. 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.

In an uninsulated attic the heat passes through roof sheathing and disperses into the attic space. Polyurethane or polystyrene spray foams can provide thorough coverage to roof rafters and attic walls in much less time than is needed for other materials. Heat from the house rises up to the attic but when there isn t one the heat rises up to the roof. Spray foam insulation that s convenient and easy to use.

Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. R value of 7 in 1 inch 97 closed cell foam.