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Originally Posted by HX_Guy
Hmm, I don't know if it actually goes all the way through or if it's just the top 1" or so both on top and the side, if that makes sense.
I actually walked around a bunch of other houses with the same floor plan that are under construction and 5 of them (including ours) had the crack in the exact same spot and 4 did not. Ours has not been tightened/tensioned yet so there is actually visible separation there but all the others it was completely tight.
Another odd thing is that there are no control joints anywhere, not even in the garage where I've always seen them in other houses. I like that there aren't any (hate the dirt etc that gets in there) but found it a bit weird to have the whole garage floor as a single piece.
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The reason you don't have control joints, is because it is a post-tension slab. This is just my opinion, but I think that using post tension slabs on single story buildings is a waste. Those systems are designed for heavy loads and to facilitate longer spans. I have also seen cases were the cables begin to corrode because they aren't properly sealed and water from the irrigation system enters the opening. So keep an eye out for that.
As for the crack itself, since your house is not the only one that has it, it probably means that they are letting the concrete sit for too long before stretching the cables. In this case, it probably isn't something that could cause structural issues in the future, but it is poor form. My guess is that the concrete won't be exposed, so you probably won't notice it once the finishes are in.