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Re: Q: Flatness Tolerances for Residenti

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Have you looked at HUD's minimum construction standards?

Have you also looked in MasterSpec (or similar) specifications?

A "generally accepted" standard is 1/4" deviation from a 10 ft. 
straightedge.  However, I have never seen one on a residential job.  Usually 
the finisher eyeballs the work and pushes the insufficient amount of concrete 
around to create what he thinks is a level slab.  And until it rains, no one 
knows the difference. 

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

Bill Polhemus wrote:

> 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.

> Thanks.

> William L. Polhemus, Jr. P.E.

> Polhemus Engineering Company

> Katy, Texas USA

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