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A dormer with an openable window (not shown) can provide access to the roof if flood waters rise too high and too quickly; the dormer should be properly insulated, flashed, and air sealed
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Calculate projection factor (PF) by dividing overhang (A) by length of window (B).
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Failure of Roof Structure from Pressurization Due to Window Failure During a Hurricane.
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Right – Flashing is installed around chimney, skylight, vents, dormers, in valleys and at eaves