Old Insulation in Crawlspace

geeshJune 30, 2011

40 yr old insulation in 4' high dirt crawlspace is dark & in poor condition. Would having a contractor REMOVE all the old overhead insulation (between crawlspace & main floor) remove most of the mildew smell from the crawlspace-seeping into the main living space ?

Yes, I have been battling this smell for some time.

Thanks for your replies.

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ionized_gw

Where are you located and what kind of climate do you have there?

    Bookmark   June 30, 2011 at 9:29PM
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hendricus

In any case get rid of the old insulation and then seal the dirt by covering with 6 mil plastic. Concrete over that if feasible. Use a dehumidifier to reduce the moisture in the crawl space.

I have a dehumidifier running now in a Michigan basement and the musty smell is almost gone. The dial read 90% to start with and is down to 65%. It took a week.

    Bookmark   July 1, 2011 at 8:10AM
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geesh

Home is on Table Rock Lake Missouri/Arkansas border. HUMID but not severe cold..

    Bookmark   July 1, 2011 at 9:04AM
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ionized_gw

Bat insulation under the floor in air conditioned homes in humid environments is generally a bad idea. You will be lucky if you only have mold and not rotten floors. Air leaks past the bats and water condenses on the subfloor and on the joists.

Fix the floor. If the crawlspace is not sealed, it might make sense to seal it from the outside. Check with a local energy rater or building expert. (First, check into it yourself. Sometimes it can be difficult to find people with up to date knowledge. http://www.buildingscience.com is a good resource.) There might be more moisture available from the air than from the ground. Alternatively, use open-cell spray foam under the floor to replace the glass.

    Bookmark   July 1, 2011 at 2:26PM
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