Rigid Foam R Value

The r value for foamular xps insulation.

Rigid foam r value.

Rigid foam r values range from r 1 for 1 4 inch thick sheathing panels to r 15 for 3 inch thick panels. Very good air bypass leak sealing properties. 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. 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.

Fiberglass insulation packs in more r value per cubic inch than rigid foam insulation does. R values vary depending on many factors including the mean temperature at which the test is conducted and the age of the sample at the time of testing. R values vary depending on many factors including the mean temperature at which the test is conducted and the age of the sample at the time of testing. 4 5 21.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. R value is not entirely a function of the thickness of the material as the facing material and type of foam used will affect the r value of the material. R 0 77 30 phenolic foam insulation r values. Rmax r matte plus 3 1 2 in.

Foam board insulation types. Rigid foam insulation packs a lot of r value into a thin package but not all rigid foam performs the same. There are three basic foam insulation board products on the. Corrosion problems when in contact with steel roofing moisture.

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. Because rigid foam plastic insulation products are not all aged in accordance with the same standards it is useful to publish comparison r value data. Rigid insulation is usually made up of fibrous materials or plastic foams. 8 3 4 4 8 2 20.

Because of this i often get questions about which type of foam board insulation to use and what r values these products provide. Rigid insulation r value by comparison usually ranges from r 4 0 to 6 5 and may get as high as r 8 7 depending on the insulation material. Because rigid foam plastic insulation products are not all aged in accordance with the same standards it is useful to publish comparison r value data. Choose rigid insulation wisely and consider the effect its characteristics will have on the performance of the your project overall product cost and the best way to get the bang for your buck.

4 8 7 21.