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Q: Flatness Tolerances for Residential Slab

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Although I’m willing to do my own research, I thought I’d try the lazy man’s way, and ask here:


What are the governing standards one can cite for the flatness of a residential slab on grade foundation?


Is there anything specific in IBC/IRC? Or would ACI be the place to go?


I’ve got a residential slab foundation that varies more than 3” in elevation between high and low, has “canyons” and saddleback ridges, etc. I need to know how to ding the contractor for this, chapter and verse.



William L. Polhemus, Jr. P.E.

Polhemus Engineering Company

Katy, Texas USA