Spray Foam Insulation R Values 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.

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. All these have r values ranging from r 3 2 to r 3 8 per inch. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. Icynene md c 200 has an r value of 6 75 per inch.

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. Closed cell spray foam 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. 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.

Icynene ld r 50 has an r value of 3 7 per inch. Icynene md r 200 has an r value of 5 2 per inch. Icynene classic max has an r value of 3 7 per inch. 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.

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. Open cell foam insulation values r3 r4. R value is determined from a controlled laboratory test of an insulation s resistance to conductive heat flow. Comparing fiberglass to foam fiberglass is the less expensive choice for wall insulation and is the spray foam insulation rental industrial spray foam insulation jun 12 2017 focusing on spray foam insulation materials there is a difference.