Insulated ductwork in closed crawlspace

297 Views 3 Replies 2 Participants Last post by Windows on Wash, May 16, 2020

KurtP

Discussion Starter · May 12, 2020

I plan to rerun insulated ductwork from the attic in a coastal mid-Atlantic area to the crawlspace which will be (further) sealed, insulated and conditioned. I will need a new trunk. Will this need to be insulated? In Green Acres fashion, what is wrong with just running the attic trunk right into the conditioned and sealed crawlspace and adjusting the floor registers accordingly.

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Windows on Wash

· #2 · May 12, 2020

If the crawl is sealed, it doesn't need to be insulated. Condition it. In the attic, needs to be insulated.

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KurtP

Discussion Starter · #3 · May 15, 2020

A major advocate of sealed crawlspaces, and selling of supplies, suggested the ductwork there be insulated.

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Windows on Wash

· #4 · May 16, 2020

Once the crawlspace is sealed, its basically conditioned space. I see no issue with making sure that the duct work is sealed for proper distribution, but to insulate it inside a space that should therefore be conditioned is wasted energy in my book.

Do you insulate the duct work in an unfinished basement?

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