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Plywood Shear wall

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I have designed an addition to my local volunteer fire department building. It is an essential facility - I called for 5 ply Structural 1 plywood for the shear walls and plywood for the roof diaphragm. The contractor would like to substitute OSB for the plywood(OSB is cheaper). In custom homes and commercial buildings it has not been a problem to allow the change. But with the Essential Facility Structure is plywood what should be used over OSB?

Or rephrased what would OSHPOD want- in a hospital building?

I know about OSB and a slightly different /stiffer interaction at the wood nail interface

Tim Rudolph PE
Bishop CA

Hanging out in Digest mode

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