Rigid Foam Insulation Attic Roof

2 snap a chalk line between the length measurements.

Rigid foam insulation attic roof.

Eps is by far the most versatile of the three rigid insulation options. Eps is also the most inexpensive of the three types of rigid foam insulation while also meeting the required building and energy codes. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. A 4 by 8 board weighs next to nothing and can easily be cut to fit.

Rigid foam panels are about 0 10 0 15 square foot r as we can see in terms of insulation value for your money the batts take a bat to all challengers. 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. Typical thicknesses range from inch to 2 inches with estimated r values of r 3 for the inch to r 10 for the 2 inch board. Measure the length and width between two rafters in your attic and transfer the measurements to a 4 ft by 8 ft of rigid foam insulation board.

It is lightweight and easy to work with. The superattic system creates a continuous air and insulation barrier directly beneath the attic roof with no thermal bridging to compromise energy performance. Now someone will look at an insulation value chart and says but foam has a higher r value per inch so it s better insulation since you have non infinite space to put it in.