My house is an early 60's model with hardwood flooring over a crawl space. There's a bit of batt insulation between the floor joists, but not much. My kids are all out of the house and the pets are on their last legs so we're planning to pull the carpet and refinish the wood floors, which are stunning.
I think I can do this myself over a few weeks. I'll pull what's left of the old stuff off and use batts that can be stapled upside down. I don't think a moisture barrier is necessary here in the high desert.
Wintertime temps regularly get down to zero or below, and the crawlspace is ventilated with several screened 6"x12" openings on the exterior walls.
My question is how much R-value is reasonable in a crawl space?