I am looking at a project with a crawl space with 6 mil poly over dirt floor with air vents
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Which has exposed piping to the weather. Should I close off vents or insulate the piping better?
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Christopher,
Q. "Should I close off vents or insulate the piping better?"
A. Seal the vents. For more information on sealed crawl spaces, see Crawl spaces or http://crawlspaces.org.