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sealed crawl walls

Sifu

Sifu

SAWHORSE
Joined
Sep 3, 2011
Messages
2,800
I have an DP specifying rock wool draped down the interior face of a crawl wall to provide the required r-value. They will have it sealed behind the poly to provide the encapsulation of the crawlspace environment. I typically see a closed cell insulation and have never seen loose batts draped this way. I am concerned about moisture wicking and being held behind the poly although if the interior is sealed maybe that is not a problem. I don't know. Anybody seen this before or have a yes or no code reference?
 
It is listed for the application and can be provided with vapor barrier attached.

According to NAIMA rock wool glass fiber and plastic foams absorb less than 1% of their weight. Cellulose will absorb 5-20 %
 
The drape insulation that I see is 4' wide fiberglass on a roll, the vinyl vapor barrier has small perforations so it can dry. It's attached to the sill plate and a sleeper near grade
 
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