I live in a 1960’s home that I’m currently doing a major remodel on. The house is built on a convential foundation with a vented crawlspace. The floor joist are 2×8’s on 16 inch centers. The subfloor is 1×6 pine, with 3/4 inch particle board over the pine. In the bedrooms the  particle board was covered with linoleum.  Another layer of peel and stick linoleum was added over that through the years. Then plush carpet with pad over the peel and stick. I put unfaced r30 fiberglass insulation between the floor joists, completely filled, and 1 inch owens corning pink fomular foam board nailed to the bottom of the floor joist. During this remodeling I have been underneath my floor in the crawlspace and found the two bedrooms sealed with the foam board covered with drops of beads of water on the bottom side. Enough of sweating that the plastic on the ground was covered in puddles of water. I removed the foam board and found the insulation damp, and termite damage on several floor joist. So I removed all of the foam board and insulation, and replaced the damaged floor joist. I am sealing the rim joist and concrete block foundation on the exterior.  I live in Zone 3. Any ideas on why I had the moisture problems? I plan on using Prosoco liquid flash on the exterior of the concrete blocks, and 2 inch fomular on the outside of that. Any advice would be helpful.