Spray In Foam Insulation 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.

Spray in foam insulation r value.

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 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. 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. 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.

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. Rigid foam boards trap air or another gas to resist 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. Focusing on spray foam insulation materials there is a difference between the two main types.

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. By expanding 100 times its original size icynene seals cracks and gaps in attics walls ceilings and other spaces where air might escape. For 6 inches r 15 or r 19 etc.

Closed cell spray foam r values. Open cell foam insulation values r3 r4. However there are open cell spray foam insulation products actually offer r 3 7 per inch such as icynene classic and. 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.

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. 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. Bulky materials resist conductive and to a lesser degree convective heat flow in a building cavity. 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.