Spray Foam Insulation R Value 2x6

In your case you have a total r value of about r 27 8 and 41 of 27 8 would be r 11 4 but in fact you have about r 13 of closed cell spray foam which is more than r 11 4 so you are good.

Spray foam insulation r value 2x6. If the house is constructed with 2x6 studs the r value when insulating with open cell foam can reach a maximum of r 20. The r value of the high density spray foam wall decreases from an installed r value of r 30 to approximately r 20 a decrease of r 10 because of thermal bridging. Spray foam insulation vs fiberglass r value is about equal for open cell insulation and about double for closed cell insulation per one inch layer. In zone 5 at least 41 of the total r value of the roof assembly needs to come from impermeable layer of rigid foam.

Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch. 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. 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. For example closed cell spray foam depending on brand can offer an r 6 or r 7 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. If you want to install spray foam in a stud wall. This gives you great r value a continuous thermal envelope and. Choose foam it green spray foam insulation kits and don t settle for less than you deserve.

Our open cell foam product has an r value of 3 5 per inch and in most applications a house constructed with 2x4 studs will have 3 5 inches of open cell foam thus resulting in a total r value of 12. The low density spray foam wall decreases from an installed insulation r value of 21 to a whole wall r value of approximately r 16. Closed cell spray foam r values. For 6 inches r 15 or r 19 etc.

After a ton of geeking out about wall assemblies including reading lots of articles and speaking with insulation experts builders and energy consultants my favorite assembly is nail base insulation zip r or atlas nail base on 2x4 or 2x6 framing with about 3 of spray foam. If you d like to start saving money and time today buy foam it green spray foam insulation now or call us at 800 516 0949. 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. Considering diy blown fiberglass insulation vs spray foam both require care to get the thickness right.

2x6 frame looking at interior insulation and thinking chris s argument for flash and batt.