Need some advice. Never seen this before. Inspected a crawlspace today. The dirt floor had been covered with a heavy 6mil plastic and then 2-3 inches of pea gravel was added.
The gravel over a considerable area of this floor was damp and had a crystal like substance on it. Looked like salt crystals. Any idea what this might be?
In addition, digging down through the gravel, the plastic itself was wet. Found no efflorescence on the concrete walls. The drainage around the house was positive. Any thoughts on why the gravel and topside of the plastic is wet?
Thanks for your help