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Non Compos Mentis
Join Date: May 2001
Location: Off the grid- Almost
Posts: 10,655
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Leave the vents open.
The insulated floor is the conditioned "Envelope", the rest of the crawlspace is not.
The vents should be closed only if the foundation perimeter walls and floor were insulated so that the crawlspace was within the heated area. Then there is no need to insulate the floor joists.
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