R-value of foam. | Ask Mason Knowles - SPF Consultant | Spray Foam Technical Questions and Answers | SprayFoam Magazine Q&A Forums

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Dave Strnad Posted: Oct 21, 2007 05:52 PM	R-value of foam. Mason, Does the R-value of spray foam increase with the thichness, like other products. I have been told that if a product has say and r-7 @ inch the r-value of 4" would be higher than R-28. If this is true is there are rule of thumb as far as percentage of increase? Also for code purposes do they look at intial or aged r-value?
mason Posted: Oct 21, 2007 06:30 PM	Most of the closed cell foams will increase with thicker applications. For example, if the foam is measured at 6.0 at one inch, it may be 6.2 at 3 inch.

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Comments

Dave Strnad

Posted: Oct 21, 2007 05:52 PM

R-value of foam.

Mason,

Does the R-value of spray foam increase with the thichness, like other products. I have been told that if a product has say and r-7 @ inch the r-value of 4" would be higher than R-28. If this is true is there are rule of thumb as far as percentage of increase? Also for code purposes do they look at intial or aged r-value?

mason

Posted: Oct 21, 2007 06:30 PM

Most of the closed cell foams will increase with thicker applications. For example, if the foam is measured at 6.0 at one inch, it may be 6.2 at 3 inch.

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