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Gypsum wallboard shearwalls

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We are having a minor discussion in our office over gypsum wall board as shearwalls. The 2006 IBC gives allowable shearwall values (Table 2306.4.5) for unblocked and blocked walls for wind and seismic loading. The IBC 2006 references ASCE 7-05 which list this type of load bearing walls in Table 12.2.1 (Line A/15) with R=2. In Seismic Design Category D, buildings with these shearwalls are permitted but limited to 35 feet in height. Can you use gypsum wall board for shearwalls? Some of us thought that this type of shearwall was not allowed in SDC D.

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