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Old 06-10-2018, 02:34 AM   #1
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Uneven concrete slab


Hi All,

We recently had a concrete slab poured for a small building. When I started working on framing layout, I found that the slab is square but not level. There is about 3/4-in difference from one end to other on the longer side (24 ft), and about 3/8-in difference on the shorter side (14ft). The slope is also not even, it is almost flat in some places and bigger steps in others. It is not more than 1/8-in over 2-ft.

The question is: What to do with framing walls? If I try to make top plate level, I need to probably cut each stud separately to match the difference. Or, I can leave it as is as frame like it is level, then deal with problems during sheating etc.

What do you do in a similar case?
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Old 06-10-2018, 07:27 AM   #2
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Re: Uneven concrete slab


Ayuh,..... Donno how ya wanta deal with it now,....

This shoulda been dealt with when the concrete forms were set,....
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Old 06-10-2018, 10:10 AM   #3
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Re: Uneven concrete slab


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Originally Posted by yilmazma View Post
Hi All,

We recently had a concrete slab poured for a small building. When I started working on framing layout, I found that the slab is square but not level. There is about 3/4-in difference from one end to other on the longer side (24 ft), and about 3/8-in difference on the shorter side (14ft). The slope is also not even, it is almost flat in some places and bigger steps in others. It is not more than 1/8-in over 2-ft.

The question is: What to do with framing walls? If I try to make top plate level, I need to probably cut each stud separately to match the difference. Or, I can leave it as is as frame like it is level, then deal with problems during sheating etc.

What do you do in a similar case?

3/4" out of level in 24 feet really isn't really that bad. Not saying I'd be happy about it, but I've framed on slabs that out of whack and once it's built, you really can't tell the difference.


If this is just an outbuilding, one approach is to frame the walls and then square them and sheath them laying down (kind of tricky on a slab but it can be done). Then stand them up and they will bridge the dips. You could even shim them level if you want. Just tie the corners together so the plates flush. Trouble with that is you need some way to lift those walls which you might not have.



Otherwise, just build as you normally would, plumb the corners, and sheath it. It will be fine.



Final approach would be to stand up posts on the corners, string a chalkline between and tap each stud to the chalk line and cut. That's overkill for a one story outbuilding, but it would yeild a perfectly flat and level top plate.
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