New Code for Post & Pier ?

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All depends on accepted or engineered lateral bracing installed. I imagine if you shear plywood walled the corners and post/pier in between, you would get the seismically/wind structural approved pretty easy. Diagonal 2x6 bracing (x pattern) greatly helps as well. Both would get you eight feet. Most fail at removing the diagonal bracing within the exterior perimeter to gain square footage, but without beefing up the exterior bracing to make up for the loss, or actually creating a framed shear plywood room, you end up with a weaker structure.

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