Moisture on inside of vapor barrior
A key issue not addressed in your posts is the condition of the studs and especially the soleplate they are attatched to. If the moisture is starting to degrade the structural integrity of the wall, immediate action is required unless you're up to tearing it all out and re-doing it. If those pieces are OK, this issue becomes an annoyance rather than a real problem.
If this is an annoyance, one option to try is to see if you can vent the moisture somewhere. It may seem counterproductive, but something that would allow the moisture to escape may be something worth trying, and if that means removing some (or all) of the most accessable vapor barrier, that might be worth it. Wet insulation is useless anyways.
If your soleplate or studs are degraded, you have little option but to at some point tear them out and replace them. I've heard that reinstalling everything with a one inch open space between the studs/insulation and the wall allows things to breathe a bit. I'm finishing out a basement now, and using that method, but it'll be a while before I learn how effective that is.
You should NEVER have two vapour bars. Most times, one on the inside, immediately under the drywall or over the studs is the right one.
I'm not sure what you mean by no foundation other than earth. There must surely be perimeter walls of some kind on footings?
You need the plastic down to keep ground moisture in the ground. That is one VB in that direction from the crawlsoace.
Then you need a VB in your joist space. Which way it faces is determined to some degreee by the climate you live in. Check by sneaking you rhaqnd up in the space and through and over the insulation at butt joints. If it is dry, you are OK. Don't bother it.
You need the VB at the earliest position possible to keep moisture from going from warmer wetter areas to cooler drier areas. If your crawl space is damp and your house is dry, you want the VB on the bottom of the insulation. If you had an open crawl space that could ventilate to the outsdier and it stayed cold because of that, you would want your VB to be near the subfloor to stop warm moist air from heading towards the cold, dry underspace. Conversely, If you live in a hot damp climate like Florida or Georgia and your house is elevated over an open crawl, the warm moist air is outside and the airconditioned air inside is cooler and drier so you wouild want the VB to be on the bottom of the insulation.
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