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Old 11-20-2011, 02:52 PM   #1
Kls
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crawl space


should spray foam include beam pocket or header in dirt crawl space

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Old 11-20-2011, 11:19 PM   #2
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Welcome to the forums!

The beam (wood) needs the 1/2" air space at sides for anti-rot. Don't SPF it. Same with the headers, are you having this professionally done?
The dirt floor should be covered with a 6mill plastic vapor barrier to meet code.

Gary

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Old 11-21-2011, 02:55 AM   #3
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Is the beam wrapped in metal at the pocket or some other sort of impermeable protection?

Open sell SPF has a very high perm rating so it will allow drying through it.
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Old 11-23-2011, 12:55 AM   #4
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What is your location?

If under the U.S. building Codes, any beam in a foundation wall requires a 1/2" air space on all sides and end for ventilation. Concrete foundations wick can moisture to the beam (called "rising damp" by BSC) even right through p.t. wood: http://www.ussteel.com/corp/construc...20Bulletin.pdf



With an open-cell foam surrounding wood with a water/moisture source, you would be courting problems:; ESP can absorb up to 4% water compared to a closed-cell (XPS) only 0.3%: http://docs.google.com/viewer?a=v&q=...t5jlOsa_kZRRgw
So any ESP touching the concrete can transmit and store water to promote rot of the wood nearby.


Is the crawlspace ventilated, since you are foaming?


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