25 Feb '12, 1am

Building an Unvented Crawl Space

Building an Unvented Crawl Space

The IRC has always called them "Closed" crawl spaces, and I consider it to be the better and more accurate term. A "Sealed" space would be as tight as a balloon - neither possible nor desirable. Here in NC the 2009 IRC the Closed Crawl Spaces section is R409. R409.5 has five options for Space Moisture Control: 1. Dehumidifier, 2.Supply Air, 3. House Air, 4. Exhaust Fans, 5. Conditioned Space. I've been functioning as a consultant re existing crawl spaces for a number of years and my approach for most spaces is to use a 6-mil plastic vapor retarder. It has all the perm you need. If there is equipment in the space I install a four foot wide piece of 16 mil from the crawl space door to the equipment and along the front of it. If there is already insulation in the floor structure I touch it up as necessary. If not, I install interior foundation insulation - I like R-10 rock wo...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/musings/bu...

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insulating crawl space #green

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United Nations Building

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