Foam Board Insulation Attic Rafters

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.

Foam board insulation attic rafters.

Often the r value of fiberglass insulation is too low and requires the rafters to be retrofitted making foam board a better choice. If you re considering turning your attic into conditioned storage or living space it s worth changing tactics to insulate between the rafters and wall joists instead of the floor. Get your kits the easy to use spray foam kit. Hire a pro to install spray foam insulation.

R value of 7 in 1 inch 97 closed cell foam. Use closed cell foam it green for attic rafters. Spray foam insulation that s convenient and easy to use. But a 2x6 rafter with a 1 5 vent space would give you the ability to put 4 of rigid insulation r 26 in that space which was not filled.

The 4 of rigid foam under the rafters at least give you r26. The superattic system creates a continuous air and insulation barrier directly beneath the attic roof with no thermal bridging to compromise energy performance. It is an excellent installation option for the attic because it is lightweight easy to work with and offers high r values. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly.

Insulating boards are just one of the many types of foam insulation. The best attic insulation. 100 free of cfcs vocs penta bdes urea formaldehyde. Consider using spray foam insulation as well to seal smaller cracks and gaps.

Foam board insulation is easy to cut with a circular saw with a masonry blade or scored with a utility knife and snapped like you would drywall. To attach the insulation you can use screws with large washers a special adhesive made for adhering foam board insulation or for smaller pieces you can seal them in with caulk or spray foam. 2 measure and cut the foam boards as. Select rigid foam insulation boards that are at least 1 2 inch less in thickness than the rafter space is deep if you plan to finish the attic as living space.

You can use rigid foam panels or do as tom silva does with nearly all houses these days. 2 would be to create the baffle in the 1st place.