Rigid Foam R Value

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.

Rigid foam r value.

The fibrous materials such as wood cane or vegetable fibers are mixed with fillers and binders to form insulation boards. 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. Phenolic foam spray insulation. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

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. Rigid insulation is usually made up of fibrous materials or plastic foams. Very good air bypass leak sealing properties.

Foam board insulation types. Rigid foam r values range from r 1 for 1 4 inch thick sheathing panels to r 15 for 3 inch thick panels. R 0 77 30 phenolic foam insulation r values. 8 3 4 4 8 2 20.

The r value for foamular xps insulation. 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. Rmax r matte plus 3 1 2 in. 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.

There are three basic foam insulation board products on the. Rigid foam insulation packs a lot of r value into a thin package but not all rigid foam performs the same. 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. Because of this i often get questions about which type of foam board insulation to use and what r values these products provide.

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. 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.

4 8 7 21.