Roof Insulation Grades

For a 1 in thick 4 8 panel.

Roof insulation grades.

The higher the r value the better the thermal performance of the insulation. Insulation level are specified by r value. R value is a measure of insulation s ability to resist heat traveling through it. Occasional very small gaps are acceptable in another place the standards say if the exterior sheathing is visible from the building interior through gaps in the cavity insulation material it is not considered a grade i installation grade ii.

Grade 3 25 psi 172 kpa min compressive strength. Class 2 faced with polymer bonded glass fiber mat membrane facers on both major surfaces of the core foam. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. The r value per inch for different types of insulation varies depending on the.

Extruded polystyrene xps easily recognized by its blue green or pink color. The table below shows what levels of insulation are cost effective for different climates and locations in the home. Up to 2 missing insulation. Used most in walls or below grade applications.

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. 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. Between 2 and 5 missing insulation.