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Rainwater will penetrate wherever there's an opening, and there are a lot more than the average person realizes. Check out the underside of the roof for wetness or mold around points of penetration (plumbing vents, chimneys), wherever different roof planes intersect (valleys) and near dormers. *These are signs you've got holes in your flashing or that the flashing was installed wrong.
|Jennifer Mathes, Ph.D.|