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RE: IBC Special inspection for Slab-on-Grade supporting HVAC unit.

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-----Original Message-----
From: Sherman, William [mailto:ShermanWC(--nospam--at)] 
Sent: Saturday, May 28, 2005 2:05 PM
To: seaint(--nospam--at)
Subject: RE: IBC Special inspection for Slab-on-Grade supporting HVAC

I've never understood this argument - how does the rebar know it's in a
slab on grade vs a structural foundation? Why does corrosion only attack
bars in structural foundations but not slabs on grade? 

-----Original Message-----

The notion here is that, unlike say a footing cast against earth, with a
SOG you are going to have a prepared subgrade. Typically, you will have
a vapor retarder of some kind underneath the slab. You are NOT nearly as
likely to have moisture migration to anywhere near the extent as you
would a "structural" foundation.

These are likely some of the reasons that SOGs are not covered by ACI
318. The assumptions as to the environment are very different.

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