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Spray Foam Insulation in a Crawl Space

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 thickness.

Carpenter Ants in InsulationThe other major issues with spray foam are; if it is sprayed on your floor joists or rim (band) joist you will not be able to inspect or repair your flooring system, it is widely known that spray foam can trap moisture and invites wood boring insects, and the building code requires an inspection gap of 3″ on the foundation wall for termites.

Spray foam may be a good alternative for the parts of your home that are above grade, but it is not a superior product for a crawl space regardless of the salesman’s insistence that it is an “air barrier” or that it is a “moisture barrier”.

 

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CrawlSpace Concepts | A Michigan Company

Crawl Space Encapsulation & Vapor Barrier Supplies

Below you will find categories related to crawl space encapsulation, crawl space repair, water problems etc.

What is crawl space encapsulation?

Crawl space encapsulation is a generic term used to describe a crawl space that is protected from moisture by using a crawl space vapor barrier on the floor and walls. There are different ways to accomplish this, as well as different results, depending on the "system" you purchase. If you hire a company or franchise to finish your crawl space make sure you get the most for your money. Crawl space encapsulation alone will help reduce moisture and improve the environment of the crawl space, but there are other components to consider like; the quality of the crawl space vapor barrier, how to close the foundation vents permanently, crawl space insulation, sealing the crawl space vapor barrier to the foundation wall, conditioning the crawl space, crawl space moisture control and lowering the homes energy costs.

To help in navigating our website we have listed the major crawl space repair subjects in category view below. Click on the headlines to learn more on that subject. The words in orange are links and can be clicked on for more information.

Please feel free to contact us if you have a question not answered on our site.

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-Matt Leech CEO

CrawlSpace Vapor Barrier Products