Rigid Foam Insulation R Value

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Rigid foam insulation r value.

The time of testing. Foam board insulation types. Because of this i often get questions about which type of foam board insulation to use and what r values these products provide. It s made of environmentally sound closed cell polyisocyanurate foam bonded to a durable white matte non glare aluminum facer and a reflective reinforced aluminum facer.

Known as polyiso for short polyisocyanurate foam has the highest r value per inch r 6 5 to r 6 8 of any rigid insulation. 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. In general rigid insulation r value is higher than that of other materials used as insulators. 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 insulation is usually made up of fibrous materials or plastic foams. When choosing rigid foam insulation you have three main options. Rigid insulation is typically a hard foam material that is used to help regulate the temperature in buildings. Used in this way the foam lowers the loss of energy through framing members a phenomenon called thermal bridging and increases the overall r value of the roof or wall assembly.

This typically makes it a more efficient choice. Our r value guide to rigid insulation includes the doe s recommended insulation by zone chart r value calculator and base building material r values chart. Rmax r matte plus 3 1 2 in. The thermal resistance of this material or effectiveness at keeping heat from passing through is known as rigid insulation r value.

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. 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. The r value for foamular xps insulation is provided from testing at two mean temperatures 40ºf and 75ºf and from two aging conditioning techniques 180 day real.

It is often used as a layer of continuous insulation on exterior walls and in the roof. 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 foam insulation packs a lot of r value into a relatively thin package. Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness.