Because that wall is a retaining wall against a slope, and the slope is a reservoir after storms. Rain and meltwater load the soil above and behind the house, and the buried wall is where that water presses, seeps, and condenses. The verdict comes from readings at the wall's base across wet and dry weeks: a wall that tracks the weather is a drainage and waterproofing conversation, exterior grading, drains, and wall treatment, while a wall that is wet in a dry month with the meter moving is plumbing. The two look identical on a damp patch and opposite on a moisture log, which is why the log is the first purchase.
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