R Value Of Canned Spray Foam Insulation

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

R value of canned spray foam insulation. However there are open cell spray foam insulation products actually offer r 3 7 per inch such as icynene classic and. Spray foam insulation seals these gaps and prevents air and moisture penetration in wall cavities rim joists attic top plates and more. Does this vary by product. Great stuff gaps and cracks insulating foam sealant is the original gap and crack attacker.

Canned spray foam is widely used to seal between a window frame and it s rough opening and around all sorts of envelope penetrations. All those openings in your home are like tunnels for heat and air. For 6 inches r 15 or r 19 etc. Open cell foam insulation values r3 r4.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Closed cell spray foam insulation. Touch n foam 2 component spray foam expands and touch n foam 2 component spray foam expands and cures quickly to fill cavities gaps cracks expansion joints and other sources of air leakage in a building envelope. Resists moisture that can lead to mold or mildew and provides increased sound and thermal 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. All these have r values ranging from r 3 2 to r 3 8 per inch. Two part closed cell spray foams have r values ranging from r 5 to r 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.

The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. 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. 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. Closed cell spray foam r values.

Simple question folks. Eliminate air leaks and you can be sure that you re getting the true r value of your insulating materials. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed your attic to reach r 30 if you live in zones 2 or 3. And if they re open cell my hunch based on stated r values then are they reliable air barriers if they re less than 3 5 to 5 5 inches thick.

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. Focusing on spray foam insulation materials there is a difference between the two main types.