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Old 09-06-2011, 04:23 PM   #1
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crawl space insulation


i live in Tennessee. My question is should I place the vapor barrier down( towards the dirt) or toward the floor side
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Old 09-06-2011, 09:01 PM   #2
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crawl space insulation


Welcome to the forum!

You really shouldn’t have any vapor retarder facing paper in your location- zone #3 or #4: “1. Zone 1, Zone 2, Zone 3 and Zone 4 (except Zone 4 Marine) do not require any class of vapor retarder on the interior surface of insulation in insulated wall and floor assemblies.” From; http://www.buildingscience.com/docum...vapor-barriers

http://publicecodes.citation.com/ico...001_par001.htm

If ducts are in crawl, you should check with your local B.D. for a closed-crawl: http://www.buildingscience.com/docum...e-humid-south/

And another with more guidelines; http://www.buildingscience.com/docum...ecommendations
If you already have the facing, and put it down toward the plastic-covered dirt----- you must cover it (asphalt covered paper) against fire with an approved barrier (fiberglass batt, drywall, plywood, etc). The flooring (if plywood or OSB) has exterior glue which is a vapor retarder, adding another (the facing) below could be asking for trouble in a vented crawlspace. With no insulation facing, I would use housewrap (vapor permeable) on the joist bottoms to prevent wind-washing in a vented crawl.

Gary
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Old 09-07-2011, 10:26 AM   #3
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crawl space insulation


Good post Gary.

Can't really sum it up any better than that there.
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