Spray Foam R Value 2x6 Wall

The best wall basement or attic insulation.

Spray foam r value 2x6 wall.

If the house is constructed with 2x6 studs the r value when insulating with open cell foam can reach a maximum of r 20. Quick comparisons and installation tips. 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. There are no circumstances in which a 2x4 wall should be on the table in your location.

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. 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. Spf insulation is rarely used in thicknesses of 10 or 15 inches. 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.

100 free of cfcs vocs penta bdes urea formaldehyde. 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. Our primary closed cell foam has an r value of 7 0 per inch and is usually sprayed between 2 to 3 inches thick resulting in an r value between 14 and 21. We ve included those values for the r value comparison of spray foam insulation vs fiberglass insulation.

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. Class i e 84 fire retardant meets building code spec. The r value of the high density spray foam wall decreases from an installed r value. 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.

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. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. The easy to use spray foam kit. The cost of spray foam insulation vs fiberglass is higher if you choose closed cell foam.

R value of 7 in 1 inch 97 closed cell foam.