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dpiedra

10:36AM | 11/12/08
Member Since: 11/11/08
1 lifetime posts
Bvhvac
I live in the Northeast and recently purchased a 1940s-era ranch house with metal ductwork running in an uninsulated crawlspace under the house. I want to insulate the ducts before winter approaches. Question: since the ducts are used for heating and cooling, can I wrap them with faced fiberglass insulation? Or will condensation form under the insulation during the air conditioning months and create mold or destroy the effectiveness of the insulation? How do I deal with that condensation issue? Any suggestions greatly appreciated. Thank you!

Billhart

11:51AM | 11/12/08
Member Since: 04/25/05
1915 lifetime posts
The best option is to convert the crawlspace to sealed or conditioned space.

http://www.buildingscience.com/documents/insights/bsi-009-new-light-in-crawlspaces/?full_view=1

This also gives some other options.

And more information.

http://www.buildingscience.com/search?SearchableText=crawlspace

BTW, the first thing that you want to do is to seal the ducts themself with duct mastic.
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