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Floating SOG at Column Locations

Floating SOG at Column Locations

Floating SOG at Column Locations

(OP)
A typical detail I see often is the bottom of the column held down say 8" or 12" from the top of the foundation wall, so the anchor bolts are 'hidden' in the foundation wall. Then the slab is poured and at the column locations it fills the void that was blocked out for the column; over the base plate, around the column and up to the top of the foundation wall. However the rest of the slab is pour so as to be 'floating' (it buts into the foundation wall w/ possibly an expansion material). I don't really see any problems occurring from this but the question comes up every so often regarding differential settlement between the portion of the slab supported by the foundation wall (at the column locations) and the rest of the 'floating' slab.

I was wondering if anyone has a problem with this or has seen problems?

Thanks!

EIT
www.HowToEngineer.com

RE: Floating SOG at Column Locations

If I'm reading this correctly then I'm surprised it would be done that way. It seems better to isolate the slab fully, including at the column locations. This is easily done with the diamond-shaped isolation joints often seen in such circumstances. Am I misreading this?

RE: Floating SOG at Column Locations

(OP)
No, I suppose that is true. Maybe I am getting myself confused because the case I am looking at is along a continuous foundation wall that actually projects above the slab. But either way in this case you would have half a diamond (or half a square).

EIT
www.HowToEngineer.com

RE: Floating SOG at Column Locations

attach a sketch, sure would be clearer

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