A “cantilevered” deck or balcony is hung on the side of a building with no support posts. Typically, the home’s framing joists are extended beyond the envelope to support the deck. Deck Flashing Done Right Here’s what to look for with deck flashing (Illustration X039). Deck boards must be spaced to allow drainage near the wall. Flashing above the deck must originate behind the siding and extend to allow drainage over or around the deck boards. Also, two-part flashing must be placed around the joist and lapped over the moisture-resistant wall covering below. ...
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