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Re: Seismic Upgrade prob. W/97 UBC

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The Building Official (not my local building
official by the way) is in fact requiring that all
plywood diaphragms be checked per Code requirements
to see if they qualify as rigid or not.  They did
not do this for the 1994 UBC.  Plywood diaphragms
designed as flexible prior to now were never
questioned.  Now they are.