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47.5 MB - The Whole Building Design Guide

47.5 MB - The Whole Building Design Guide

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A vulnerability assessment of the roof deck should include evaluatingthe existing deck attachment, spot checking the structuralintegrity of the deck (including the underside, if possible), andevaluating the integrity of the beams/joists. If the deck attachmentis significantly overstressed under current design windconditions or the deck integrity is compromised, the deck shouldbe replaced or strengthened as needed. <strong>The</strong> evaluation should beconducted by an investigator experienced with the type of deckused on the building.If a low-slope roof is converted to a steep-slope roof, the newsupport structure should be engineered and constructed to resistthe wind loads and avoid the kind of damage shown inFigure 3-108.Figure 3-108:<strong>The</strong> school’s woodsuperstructure installedas part of a steep-slopeconversion blew awaybecause of inadequateattachment. HurricaneKatrina (Louisiana, 2005)3-136 MAKING CRITICAL FACILITIES SAFE FROM High Wind

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