Foam Board Insulation Attic Rafters

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.

Foam board insulation attic rafters.

The superattic system utilizes proprietary silverglo rigid foam insulation panels to fully seal and insulate the attic directly beneath the roof rafters and directly inside the gable ends. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. Hire a pro to install spray foam insulation. 2 measure and cut the foam boards as.

Consider using spray foam insulation as well to seal smaller cracks and gaps. Spray foam insulation that s convenient and easy to use. 100 free of cfcs vocs penta bdes urea formaldehyde. Use closed cell foam it green for attic rafters.

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. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. Often the r value of fiberglass insulation is too low and requires the rafters to be retrofitted making foam board a better choice. It is an excellent installation option for the attic because it is lightweight easy to work with and offers high r values.

Insulating boards are just one of the many types of foam insulation. 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. 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. 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.

You can use foam board in the attic. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Class i e 84 fire retardant meets building code spec. You can use rigid foam panels or do as tom silva does with nearly all houses these days.