Spray Foam Insulation R Values 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.

Spray foam insulation r values per inch.

Closed cell spray foam is the most expensive residential insulation available. Closed cell spray foam insulation. R values are additive so you can multiple the number of inches of insulation thickness times the r value to arrive at a total insulation value. That means if you used foam it green closed cell which is r 7 per inch it s r value for a 3 5 deep wall.

Closed cell spray foams provide a higher r value per inch than less expensive insulation types like fiberglass cellulose or open cell foam all of which have r values of r 3 2 to r 3 8 per in. Open cell foam insulation values r3 r4. Icynene classic max has an r value of 3 7 per inch. Icynene md c 200 has an r value of 6 75 per inch.

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. R value is determined from a controlled laboratory test of an insulation s resistance to conductive heat flow. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. Icynene ld r 50 has an r value of 3 7 per inch.

All these have r values ranging from r 3 2 to r 3 8 per inch. Open cell spray foams are between 5 and 1 lbs per cubic foot and have an r value of 3 0 4 0 per inch of insulation. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. Icynene classic ld c 50 has an r value of 3 7 per inch.