Spray In Foam Insulation R Value

Open cell foam insulation values r3 r4.

Spray in foam insulation r value.

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 example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. Traditional insulation such as cellulose or fiberglass is not comparable to spray foam insulation in r value as those insulation methods use r value of heat transfer. 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.

By expanding 100 times its original size icynene seals cracks and gaps in attics walls ceilings and other spaces where air might escape. Rigid foam boards trap air or another gas to resist conductive heat flow. Icynene sprayed in foam is an insulation and air seal system that works to help ensure that your home doesn t suffer from air loss while providing an effective r value. 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 r values. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. The r value of spray foam insulation is approximately 6 per inch so those using spray foam as their insulator will need about 6 3 inches of thickness to reach r 38. 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.

However there are open cell spray foam insulation products actually offer r 3 7 per inch such as icynene classic and. Focusing on spray foam insulation materials there is a difference between the two main types. Closed cell spray foam insulation. All these have r values ranging from r 3 2 to r 3 8 per inch.

The r value of fiberglass insulation is approximately 2 2 per inch so much thicker fiberglass insulation is required to achieve the same r value of 38. 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. Open cell spray foam insulation is air impermeable and is applied with a minimum of 3 5 on average and can be used for attics interior floors walls and soundproofing. According to industry publication fine home building the r value for open cell spray foam is between r 3 5 r 3 6 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.