Closed Cell Spray Foam Insulation R Value Per Inch

Closed cell spray foam insulation.

Closed cell spray foam insulation r value per inch.

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. They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. Offering a high r value per inch johns manville corbond iii closed cell spray polyurethane foam provides air sealing and moisture control in a single install step. Johns manville corbond iii closed cell spray polyurethane foam insulation offers and r value of r 7 per inch and can be applied in a single pass to a maximum of 3 5 inches providing superior thermal performance with seamless air sealing and moisture control in a single step.

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. 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. Most spray polyurethane foam is called two component foam. Closed cell spray foams are between 2 and 4 lbs.

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 inches of closed cell foam will provide r12 r14 of insulation. 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. The r value of closed cell foam is r 6 5 7 per inch.

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. All these have r values ranging from r 3 2 to r 3 8 per inch. Comparing fiberglass to foam fiberglass is the less expensive choice for wall insulation and is the spray foam insulation rental industrial spray foam insulation jun 12 2017 focusing on spray foam insulation materials there is a difference. Closed cell foam r values spray with an r value of 3 5 per inch per inch of thickness.

Just like for open cell foam r values are additive.