Roof Insulation Grades

Insulation level are specified by r value.

Roof insulation grades.

Up to 2 missing insulation. Grade 3 25 psi 172 kpa min compressive strength. The higher the r value the better the thermal performance of the insulation. The table below shows what levels of insulation are cost effective for different climates and locations in the home.

Class 2 faced with polymer bonded glass fiber mat membrane facers on both major surfaces of the core foam. Used most in walls or below grade applications. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Falls in the middle of the three types of rigid foam insulation in both cost and r value.

Extruded polystyrene xps easily recognized by its blue green or pink color. While there are additional considerations such as venting and moisture problems to take into account when you insulate under floors the united states department of energy recommends an r 25 rating in cold climates and an r 11 in warmer parts of the country. For a 1 in thick 4 8 panel. The r value per inch for different types of insulation varies depending on the.

R value is a measure of insulation s ability to resist heat traveling through it. Type iii faced with a perlite insulation board on one major surface of the core foam and an organic inorganic asphalt. Between 2 and 5 missing insulation.