Roof Insulation Grades

The table below shows what levels of insulation are cost effective for different climates and locations in the home.

Roof insulation grades.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. 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. For a 1 in thick 4 8 panel. The higher the r value the better the thermal performance of the insulation.

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. The r value per inch for different types of insulation varies depending on the. Recyclable and at about r 5 per inch costs around 42 per sq. Used most in walls or below grade applications.

Grade 3 25 psi 172 kpa min compressive strength. Insulation level are specified by r value. 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.

Class 2 faced with polymer bonded glass fiber mat membrane facers on both major surfaces of the core foam. Extruded polystyrene xps easily recognized by its blue green or pink color. Falls in the middle of the three types of rigid foam insulation in both cost and r value.