Home Improvement Questions? Ask a Handyman for Answers
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If you have a vapor barrier up against the floor (where it should be ) then you're right to have some concern about applying a second barrier on the bottom of the joists. But this is often done when there is a wet crawl space. So it's not a big deal since it's unlikely water will get trapped in the floor between the 2 vapor barriers. However the best option would be to use Tyvek or a similar product. These products allow water vapor to pass through and have the added benefit of being a pretty tough material that's a lot more resistant to punctures than poly sheeting.
You're welcome. I meant a vapor barrier up against the underside of the floor in the living space.
My pleasure. I'd appreciate a favorable rating