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Crawl Space Repair & Encapsulation

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Spray Foam Insulation in a Crawl Space

by | Monday, May 4, 2015 |

It sounds like a good Idea“Spray foam is a good moisture barrier with a low perm rating“, False. Closed cell spray foam has a perm rating of 2.6 at a thickness of 1?. In order to get to a perm rating of less than 1, the spray foam will need to be a minimum of 3.5? thick. This type of insulation has a fairly high R-value at 6.0 per inch. This means that you will need to buy an R-21 worth of spray foam in order to get a perm rating under 1.0. This product is priced by the square foot per inch of...

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