Rigid Foam Insulation R Value Chart

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Rigid foam insulation r value chart.

Because of this i often get questions about which type of foam board insulation to use and what r values these products provide. 4 8 7 21. Foam board insulation types. 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. 1 844 446 7858 my account. 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. Other materials may only have a fifty percent increase in r value when their thickness is doubled.

It provides about r 5 per inch. The r value at 180 day real time age and 75ºf mean temperature is. Phenolic foam spray insulation. It provides r values that range from 3 6 to 4 2 per inch.

R 0 77 30 phenolic foam insulation r values. Some products have reinforced facing to make them sturdier. 8 3 4 4 8 2 20. 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. 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. Standard r value of r 5 8 per inch the manufacturing process starts with liquid foam not recyclable has to be sprayed against a substrate to form a rigid panel so all iso panels are faced different facings affect the performance of the panel in both durability and perm rating. As a benchmark one inch of solid wood has an r value of 1.

R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. The common denominator among varieties of insulation is the r value. 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. There are three basic foam insulation board products on the.

In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. This material offers the highest r values about r 6 to 6 5. Choose this option for areas that need a good amount of strength and water resistance.