Spray Foam R Value 2x6 Wall

This r value is similar to that of r13 fiberglass batting.

Spray foam r value 2x6 wall.

The r value of the high density spray foam wall decreases from an installed r value. This is very important in situations where your code requires an r 21 for the wall but you only have a 2 4 stud because closed cell spray foam is the only way you would achieve the required r value to meet code. Dense spray foam is installed. That means if you used foam it green closed cell which is r 7 per inch it s r value for a 3 5 deep wall cavity would be r 24 5.

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. 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. Two staggered 2x4 frame walls with exterior foam sheets and interior fiberglass or cellulose will get you a better thermal break higher r value and a much quieter house than 2x6 construction. Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch.

Using two dimensional heat flow analysis with thermal bridging effects and average framing factors it is clear that the thermal bridging through the framing bottom plate and top plate reduces the effectiveness of the spray foam insulation. Choose foam it green spray foam insulation kits and don t settle for less than you deserve. However fiberglass generally does not provide as tight a seal as a foam product would since it is unable to achieve as tight of a seal.