Rigid Foam Insulation R Value Chart

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Rigid foam insulation r value chart.

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 time aged as mandated by astm c578 and a method of accelerated aging sometimes called long term thermal resistance lttr per can ulc s770 03. Foam board insulation types. 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. As a benchmark one inch of solid wood has an r value of 1.

Very good air bypass leak sealing properties. 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. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. Other materials may only have a fifty percent increase in r value when their thickness is doubled.

4 8 7 21. 1 844 446 7858 my account. Some products have reinforced facing to make them sturdier. It provides r values that range from 3 6 to 4 2 per inch.

It provides about r 5 per inch. Corrosion problems when in contact with steel roofing moisture. There are three basic foam insulation board products on the. R 0 77 30 phenolic foam insulation r values.

This material offers the highest r values about r 6 to 6 5. 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 a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Phenolic foam spray insulation.

The common denominator among varieties of insulation is the 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. 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. Choose this option for areas that need a good amount of strength and water resistance.

Because of this i often get questions about which type of foam board insulation to use and what r values these products provide. 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. As a foil faced polyisocyanurate foam insulation enerfoil tm s r value actually more than doubles when it is twice as thick as you can see from the chart above.