Attic Rafter Insulation Board

Hire a pro to install spray foam insulation.

Attic rafter insulation board.

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. This foam board insulation is available with straight or tongue and groove edges to help limit air movement. It is denser than eps and provides more r value with a rating of 5 per inch of thickness. 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.

The superattic system creates a continuous air and insulation barrier directly beneath the attic roof with no thermal bridging to compromise energy performance. R value for fiberglass or wool batts per inch is between r3 and r3 5. 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. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

You can use rigid foam panels or do as tom silva does with nearly all houses these days. Rolls are usually used for long expanses such as length of floor for entire attic while batts are fit between studs in attic rafters.