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Commercial Construction Standards

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A couple of comments:

1. If you look in Sweets, you will find that the weights of suspended 
ceilings (T-bar) are closer to 2.5 to 3.5 psf rather than the 1.5 psf that is 
generally stated in manuals.

2. ACI Guide for Concrete Floor and Slab Construction recommends that 
contraction joint spacing (in feet) be 2 to 3 times the slab thickness (in 
inches).  Thus, for a 4" slab, the joint spacing should be 8 to 12 feet.  
Since your climate is similar to ours, I would suggest the 8 foot spacing be 

Hope this helps.

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