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While many of the building failures I investigate are caused by some structural oversight — like a weak framing member or an inadequate connection — just as many have another cause: water intrusion. Over the years, I have seen many cases of decayed framing, water-damaged interiors, and opportunistic carpenter ants nesting in wall framing, all because the builder failed to provide weathertight detailing. Roofs generally receive a lot of attention, but keeping the water out of walls is equally important. It's easy to overlook important details when jobs fall behind schedule or the work gets rushed because of impending rain. Here are the most common trouble spots I see, with advice on proper prevention. Housewrap Before installing siding, cover the sheathing with some