Foam Insulation R Value Chart

As a benchmark one inch of solid wood has an r value of 1.

Foam insulation r value chart.

R value is the only measurement used in building codes today however it is not the only way to stop energy loss. The common denominator among varieties of insulation is the r value. Closed cell spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. The higher the r value the better the thermal performance of the insulation.

The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. As always should you have any questions or require any assistance in planning your spray foam insulation job please contact us we are always happy to help. Installing more insulation in your home increases the r value and the resistance to heat flow.

Recommended home insulation r values. Foam board insulation types. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Because of this i often get questions about which type of foam board insulation to use and what r values these products provide.

Rmax r matte plus 3 1 2 in. Closed cell open cell spray foam r values. It has a lower r value per inch than closed cell foam and is vapor permeable. R 0 77 30 phenolic foam insulation r values.

Phenolic foam spray insulation. R value is a measure of insulation s ability to resist heat traveling through it. Insulation level are specified by r value. Use the following chart to estimate an ideal r value for your insulation project.

Very good air bypass leak sealing properties. R 3 2 polyisocyanurate rigid foam insulation board r matte plus 3 thermasheath 3 is rigid foam r matte plus 3 thermasheath 3 is rigid foam plastic thermal insulation board. I ve written several posts about how to insulation basement walls in which i promote the use of foam board insulation as the first line of defense against moisture and mold. 4 8 7 21.

When calculating the r value of a multilayered installation add the r values of the individual layers. 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. Closed cell spray foam insulation. 8 3 4 4 8 2 20.

There are three basic foam insulation board products on the. It measures the effectiveness at stopping energy loss by way of conduction one of the 3 forms of energy transfer. The r value of some insulations also depends on temperature aging and moisture accumulation. The table below shows what levels of insulation are cost effective for different climates and.

4 5 21. Corrosion problems when in contact with steel roofing moisture.