5 Nominal Open Cell Foam In Floor

Open cell spray foam r values open cell spray foam typically has an r value of 3 5 per inch and it should be noted that open cell does not form a tight air seal.

5 nominal open cell foam in floor. So the code official has the option of using that type of data to allow lessor thickness of insulation. In the hybrid application a layer of closed cell foam is first sprayed on the bottom of the floor to provide an air seal. Closed cell foam can be made with densities as high as 1 7 to 2 0 lbs cu. Multiple pimmediate passes with no wait time may also be applied.

There is strong research evidence to indicate that 5 5 inches of open cell foam provides the same energy efficiency of r 38 of blown in fiberglass in attic floors. 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. Most open cell foam has a density of about 5 pounds per cubic foot. In stock and ready to ship.

But there would be a considerable waste factor when you have to trim back the excess foam flush with the studs. At 3 5 inches would have an r value of 12 13. Closed cell foam can be over three times that with a density of 1 75 pounds per cubic foot or more. Ok have a new spray foam quote.

2 5 inches nominal ccspf walls 11 inches nominal ocspf floor is this standard verbiage. Closed cell foam has a higher r value than open cell foam usually about 6 0 per inch. With high yield and excellent adhesion it s an. Insulating value and strength.

But you also have to satisfy code requirements. Next another form of insulation such as fiberglass is added to bring the total r value to desired level. Open cell foam has an r value of about 3 5 to 3 7 per inch while closed cell foam has an r value of about 6 per inch. It performs much better than any form of batt for stopping air flow but it is not as complete of an air seal as closed cell spray foam.

The higher density not only allows for it to be molded for decorative or light structural uses it also provides r values of about 6 0 per inch. Ft with an r value insulation factor of about 3 5 per inch. Open cell foam is much easier to trim than closed cell foam so i would not expect a considerable extra labor expense between the 3 5 and the 3 0 thickness.