Wednesday, November 11, 2009

RE: slab flatness

You are correct.  Flatness of a SOG is a service issue and is not a code issue.  You can make it a specification issue by putting requirments in the project specification for flatness.  Getting better flatness is not hard with today's laser screeds.  I have proven to contractors that it is cheaper to rent a laser screed and cut down the number of workers on a slab placement.  The bonus is a much flatter SOG and happier client. 

Regards, Harold Sprague

> Date: Wed, 11 Nov 2009 09:58:01 -0500
> From:
> To:
> Subject: slab flatness
> As far as I understand it, slab flatness is not a building code requirement. It depends on building and its intended purpose, and it specified by the architect or engineer according to what the owner wants. A floor supporting sensitive medical equipment is much different then a residential SOG. My code searches in Florida BUilding Code (basically the IBC) confirms this. ACI 117 had guidelines and recommendations, but these are up to the owner and design team to incorporate into the design specs or drawings.
> Anyone know anything that contradicts this?
> Therefore, the average residential SOG is screeded with a 2x4 and a level and little else, and if you did a floor slab survey you may indeed encounter differences throughout the slab of an inch or so? This is what I would anticipate. As long as the interior walls, flooring, cabinets and other finishes can be installed, and it is not noticable to the naked eye, this is acceptable...
> Thanks for your opinions,
> Andrew Kester, PE
> Florida
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