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Today's first inspection. Water main, where it enters through the foundation, sweating like crazy. I think it's been doing it for quite a while as there was quite a puddle of water on the crawl floor. Water was stagnate. Mold growing on the plywood sub-floor.

I am guessing high humidity would cause this? poor ventilation? both?

Home was built in 63. Outside temp around 50 degrees.

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Looks like too much water for condensation alone. Maybe ground water is traveling along the buried pipe and entering the crawl through the pipe penetration.

Are you sure its mold (3rd pic) on the plywood? It looks like the pattern is limited to specific pieces of sub floor. Why would mold grow only on that piece and not on the other piece of plywood or floor joists?

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It might be a combination of the two.

I've been in at least two rain forest basements in the last couple of years that were so wet and humid from ground water, that the whole cold water plumbing supply system, the joists, and the bottom of the floor were dripping water.

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