New answers tagged moisture
It is absolutely normal. What you do not want to see is standing water under it. I have seen moisture under my plastic all the times I visited my crawlspace, mold has never been a problem. The idea is though to have no organic material like wood, grass, anything else that would decay, trapped under the plastic.
Here in Arizona many older homes are built of cinder block, often just painted inside and out, no framing, no drywall, no insulation. This comes from an era when running a swamp cooler in the summer was cheap, and a gas furnace or electric heat in the brief winters was also cheap. Some of the older homes were PANELED on the inside, probably not a great idea ...
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