Spray In Foam Insulation R Value

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.

Spray in foam insulation r value.

All these have r values ranging from r 3 2 to r 3 8 per inch. By expanding 100 times its original size icynene seals cracks and gaps in attics walls ceilings and other spaces where air might escape. 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. 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.

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. For 6 inches r 15 or r 19 etc. Closed cell spray foam insulation. Bulky materials resist conductive and to a lesser degree convective heat flow in a building cavity.

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 has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. Open cell foam insulation values r3 r4. 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.

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. For example closed cell spray foam depending on brand can offer an r 6 or r 7 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. 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.

Focusing on spray foam insulation materials there is a difference between the two main types. 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. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. Insulation materials run the gamut from bulky fiber materials such as fiberglass rock and slag wool cellulose and natural fibers to rigid foam boards to sleek foils.

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.