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Jeff Sweenor shows the apprentices how to fasten a clapboard to the sill for a pitch and how to waterproof the system with flashing tape. Then they apply a bead of caulk around the three sides but not the bottom so the water can go out from underneath. Then they use shims to lift the window a tiny bit to allow water to escape. Then the window goes in, bottom first.
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Window Class Back in Session | This Old House