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[SEAOC] Plywood Shear Wall over Gyp Board

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At the risk of sounding dumb, I would like opinions on using plywood over gyp
board for a seismic retrofit.  The building is an existing tilt-up concrete
building with a large existing wood mezzanine.  One wall of the mezzanine has
gyp board on both sides which is inadequate for resisting shear.  The
question:  To save money, can (or should) plywood be attached directly over
the gyp board without first removing the gyp board?

Thanks.  Carl S.

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