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Re: Joints in Slab on Grade

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Maybe it would depend on what the slab is for,  but I think it is typically considered part of the designer's (engineer's) responsability to layout out the jointing plan,  showing both construction and contraction joints.   The contractor can ask to make changes,  i.e. switching the location of a construction and contraction joint, but the designer would have to approve it.

Nominally the engineer should have chosen a joint spacing that is appropriate for the slab thickness, reinforcement ratio, construction method, and project (owner's) requirements.  This is a large part of what they are getting paid for.

Gail Kelley