Open Cell Spray Foam R Value Chart

The r value your insulation needs depends on your local climate.

Open cell spray foam r value chart. The r value for open cell is typically around 3 7 at 1 thick and varies by manufacture. And the department of energy s corresponding climate zone. 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. 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.

Closed cell spray foam insulation. When applied on the interior open cell spray insulation provides performance advantages that differ from those of closed cell spray foam used on the exterior. The map above shows each region of the u s. It has a lower r value per inch than closed cell foam and is vapor permeable.

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. Open cell spray foam r values. Why r value is not as critical you paring insulation types insulation r value chart marine grade foam sheets closed cellwhat is the highest r value insulation ratings types chartsclosed cell spray foam iowaopen cell spray foam iowatiger foam spray insulation r value chartremodeling an insulation r value chart is only the firstopen cell vs read more. Use the following chart to estimate an ideal r value for your insulation project.

Just like for open cell foam r values are additive. Once you find your home s zone on this map you can use the below insulation r value chart to determine the minimum r value your insulation should have. Two inches of closed cell foam will provide r12 r14 of insulation. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.

They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. 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. 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. 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.