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SLAB - Control Joints in Concrete Slab o

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Reference ACI Materials Journal, May-June, 1989, "Guide for Floor and Slab 
Construction," reported by ACI Committee 302, pg 252 - 296. (There is now a 
1997 version of this report --- See ACI Publication Catalog, page 69) 

Section 2.3.2 on Contraction Joints (Control Joints) states that the maximum 
spacing (in feet) for non-structural slabs should be 2 to 3 times the slab 
thickness (in inches).  For a 4" slab, the maximum spacing would be 8 to 12 
feet.  Additional caveats are stated.  (In Arizona's hot, dry climate, the 
shorter distance would be the one I would use.)

Hope this helps.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona