I’m in Virginia and have inspected a home with a ventilated and dry crawlspace, but no vapor barrier. House was built in 1990. If the crawlspace is well ventilated and dry with no signs of any water damage, should I recommend a vapor barrier because that’s the current rule of thumb? My gut tells me to leave it alone.
Also, any idea what year vapor barriers in the crawl space became a rule?
No idea what year, but it’s a good idea. I would recommend it as an upgrade and additional protection, this puts the choice and the liability on the client. When in doubt make sure you cover your own backside.