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George Tsongas, Ph.D., P.E., is a consulting engineer and building scientist and professor emeritus of mechanical engineering at Portland State University, Portland, Ore.
Despite popular belief, vinyl siding does not always hang loose enough to dry condensed indoor moisture.
In cold climates,wide, impermeable flashing can inhibit drying, leading to some nasty rot around window and door openings.
Don't ignore that green roof growth; it might be causing expensive damage not only to the shingles but also to the rest of the structure .