Spray Foam Insulation R Value Chart

It performs much better than any form of batt for stopping air flow but it is not as complete of an air seal as closed cell spray foam.

Spray foam insulation r value chart.

4 8 7 21. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. Use the following chart to estimate an ideal r value for your insulation project. As always should you have any questions or require any assistance in planning your spray foam insulation job please contact us we are always happy to help.

R 0 77 30 phenolic foam insulation r values. Very good air bypass leak sealing properties. 4 5 21. Just like for open cell foam r values are additive.

Phenolic foam spray insulation. Corrosion problems when in contact with steel roofing moisture. Closed cell spray foams are between 2 and 4 lbs. For example insulation that is compressed will not provide its full rated r value.

Contractors often use it to insulate under slabs ceilings walls and roofs. As a benchmark one inch of solid wood has an r value of 1. Open cell spray foam r values open cell spray foam typically has an r value of 3 5 per inch and it should be noted that open cell does not form a tight air seal. All these have r values ranging from r 3 2 to r 3 8 per inch.

8 3 4 4 8 2 20. 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 r value of closed cell foam is r 6 5 7 per inch. Closed cell spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam.

The overall r value of a wall or ceiling will be somewhat different from the r value of the insulation itself because heat flows more readily through studs joists and other building materials in a phenomenon known as thermal bridging. 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. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.