R Value Of Canned Spray Foam Insulation

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.

R value of canned spray foam 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. 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. 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. Canned spray foam is widely used to seal between a window frame and it s rough opening and around all sorts of envelope penetrations.

Simple question folks. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. Two part closed cell spray foams have r values ranging from r 5 to r 6 per inch. Does this vary by product.

Focusing on spray foam insulation materials there is a difference between the two main types. All these have r values ranging from r 3 2 to r 3 8 per inch. 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. Open cell foam insulation values r3 r4.

But are canned spray foams open or closed cell. Resists moisture that can lead to mold or mildew and provides increased sound and thermal insulation. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. 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.

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. However there are open cell spray foam insulation products actually offer r 3 7 per inch such as icynene classic and. All those openings in your home are like tunnels for heat and air.

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. For 6 inches r 15 or r 19 etc. Closed cell spray foam insulation. 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. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.