Spray Foam Insulation R Value Chart

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Spray foam insulation r value chart.

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. They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. Use the following chart to estimate an ideal r value for your insulation project. 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.

Just like for open cell foam r values are additive. Very good air bypass leak sealing properties. The common denominator among varieties of insulation is the r value. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and.

Closed cell spray foams are between 2 and 4 lbs. R 0 77 30 phenolic foam insulation r values. 4 5 21. As a benchmark one inch of solid wood has an r value of 1.

Corrosion problems when in contact with steel roofing moisture. Phenolic foam spray insulation. For example insulation that is compressed will not provide its full rated r value. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

8 3 4 4 8 2 20. Two inches of closed cell foam will provide r12 r14 of insulation. The r value of closed cell foam is r 6 5 7 per inch. 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. Contractors often use it to insulate under slabs ceilings walls and roofs. All these have r values ranging from r 3 2 to r 3 8 per inch.