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Re: Crack Control Joints - Unreinforced Slab on Grade

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Assuming there is only foot traffic, that the soil is non-expansive, and
that you are using a 4" slab, I would have sawed joints at 20'x 20' and
use #3 @ 18" each way, in the center of the slab.

Stan Scholl, P.E.
Laguna Beach, CA

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