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Question DetailsAsked on 9/20/2017

How much is a fair price to wrap ductwork in a crawlspace under a home?

Crawl space is upgraded and clean. Im wanting the existing ductwork wraped.

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1 Answer


Not sure what kind of "wrap" you mean - I would assume insulation but not clear. There are also several ways to insulate ducting - wrap-around insulation (usually foil-coated) and spray foam insulation probably being the most common.

And unless the ducting is free-hung below the joists, all-around insulation can actually be a detriment, because if the ducting is up in the joists, insulating the joist bay rather than the ducting so the top of the ducting is exposed to the floors is desireable, to provide effectively under-floor heating/cooling, so you need to be careful what the intent is - and of course existing flooring configuration and insulation affects the plan too.

Also - in areas where the crawlspace can get below freeing, you have to be careful about water and drain pipes - sometimes the ducting is providing the heat which keeps them from freezing. I have seen cases where insulating the ducting to limit heat loss has resulted in pipe freezeup. Can also result in "cold" winter floors where the "waste" heat previously kept them warm.

Here are a couple of previous questions with answers on duct insulating costs FYI - one on pipe insulation, one on spray-foam joist bay insulating. The duct insulating one talks of a per SF cost - that would be per square foot of ducting, so you would have to estimate the average surface area of the ducting to ballpark the job cost. ALso - spray foam insulation will commonly have about $200-250 minimum charge on small jobs, because of the equipment cost and cleanup time that is needed regardless of job size.

Oh - BTW - in crawlspace I would be sure any foam-in-place foam insulation is sprayed with a pesticide after installation (a few usually commercial building insulation companies can inject it into the foam mix) if you are in an area with insect issue, particularly termites or carpenter ants - because it makes ideal nesting conditions for them. And if using a duct-wrap insulation, avoid the "organic" ones now on the market - you want fiberglass without paper facing (foil is OK) so you are not providing any food source for insects in there.

Answered 3 years ago by LCD

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