Exterior Rigid Foam Insulation R Value

More effective insulation with r values ranging from 3 6 to 8 0 rigid foam sheathing has much better insulation per inch than other materials i e.

Exterior rigid foam insulation r value.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. Falls in the middle of the three types of rigid foam insulation in both cost and r value used most in walls or below grade applications recyclable and at about r 5 per inch costs around 42 per sq. House wrap is a good idea even with foam on the outside of the house. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14. C or thermal conductance of these materials is the reciprocal of the r value. Also included is the hugely helpful insulation zip code calculator that spells out the suggested amount of r value necessary for the different portions of a structure like foundation interior and exterior walls attic and more.

For example a house with 2 6 walls in climate zone 6 would need rigid foam with a minimum r value of r 11 25. Foam insulation densities vary among closed cell vs open cell forms. This foam board insulation is available with straight or tongue and groove edges to help limit air movement. R 7 5 scored squared edge rigid foam board insulation sheathing model 88wd view the owens corning exterior insulation.

Rigid foam insulation one option is to use polyurethane rigid foam insulation. Closed cell foams are more dense and rigid typically about 2 lb cu. Polyurethane rigid foam is a. It is available with r values ranging from r 18 to r 28 at a 3 inch thickness.

3 benefits of rigid foam sheathing. This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. Owens corning foamular 150 1 1 2 in. It is denser than eps and provides more r value with a rating of 5 per inch of thickness.