Closed Cell Foam R Value Chart

Two inches of closed cell foam will provide r12 r14 of insulation.

Closed cell foam r value chart.

For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. Closed cell foam r6 r8. That said the table is useful. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.

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. For 6 inches r 15 or r 19 etc. Closed cell spray foam r values. The r value for closed cell is typically around 6 7 at 1 thick and varies by manufacturer.

They contain low conductivity gases in the cells usually one of the hcfc or cfc gases the higher r values r 7 0 to 8 0 are the result of thermal resistance of the gases in the cells. As a benchmark one inch of solid wood has an r value of 1. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. If you want to install spray foam in a stud wall and price is no object then it would seem to make sense to specify closed cell spray foam right.

It has a lower r value per inch than closed cell foam and is vapor permeable. Closed cell spray foams are between 2 and 4 lbs. Why spray foam insulation is so effective in meeting code requirements is that it has a higher r value per inch of product used than batts. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7.

They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. Additional r value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included such as 1 solid foam polyisocyanurate r 8 extruded polystyrene r 5 expanded polystyrene r 4 or 1 of perlite r 2 7 and for an exterior air film winter no wind r 0 17 an interior. Closed cell spray foam insulation is vapor and air impermeable and is applied with a minimum of 2 on average with use on on interior and exterior building applications. Polyurethane and polyisocyanurate are both closed cell foams.

Open cell spray foam has an r value of about r 3 7 per inch while closed cell spray foam has an r value that may be as high as r 6 5 per inch. Closed cell spray foam insulation. Both closed cell spray foam and open cell spray foam insulation can be used effectively in commercial building designs to allow the building to achieve energy efficiency and consistent performance. Just like for open cell foam r values are additive.

Note that some commercial and industrial buildings may require higher r values.