Should there be a plastic moisture barrier over the stone?
Your building code likely REQUIRES it.
A minimum of a 6 mil plastic sheeting over bare earth is required in most cases.
Inhibiting mold growth is related to inhibiting moisture.
Prevent moisture; Prevent mold.
Placing 6 mil plsatic over the ground and water/vapor proofing the walls of the crawl or basement will relieve you of mold problems.
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