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Re: minimum fc for Residential slab on grade

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Dennis,

Since the introduction of the 1997 UBC the requirement (and as important the enforcement) of the Code has been for all concrete to be Standard 2500 (f`c = 2,500 psi) and no Deputy Inspection unless the strength specified is greater than Standard 2500.

This interpretation comes from the larger building departments and has spread to the outlying areas. I am surprised that it has taken this long to get to the jurisdictions that you work in.

The builders complain, but in reality it only represents a small increase in the cement ratio to the rock and sand. Non-compliance is not an option.

John Ott