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Re: CRAWL SPACE VENTS
In the South I would advise folks to open the crawl space vents.
A sealed crawlspace is only good if it was designed to be sealed. I have seen numerous problems with crawl spaces that have been sealed and they were not originally built to be sealed.
If the ground is prone to being damp, then you don't want to seal that moisture in.
As for vapor barriers, the IRC requires them so I would hope that all new construction has one.
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