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Is this a huge problem? The house frame is about 2" off the slab along the north side. On the other sides of the home it varies by 1", but not in as many places.

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In and of itself, probably not the end of the world. But it sure seems like a giant red flag to me that the contractor has screwed up a lot more than just that. – DA01 Jan 17 '13 at 6:51
I would be very concerned. – Brian Jan 21 '13 at 18:18

If I were a buyer I would beware.

Why is the house frame not firmly on the foundation?
2" off the slab is more than half the width of the 2x4 base of a wall.

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Given that the bottom plate is supposed to be firmly bolted to the foundation... Heh? Why's it trying to take a walk in the country? As Matthew points out, in 2x4 frame construction, the lumber dimension is 1 1/2 x 3 1/2. If it was 2x6 construction, this is still highly suspect. – Fiasco Labs Jan 16 '13 at 1:28
Thanks for your comment We do have 2x6. – Beverly Hudson Jan 16 '13 at 14:37
2 inches is more than one-third off the base of 2x6 framing. – Matthew Jan 16 '13 at 15:29

I would start by evaluating the north wall section in several ways. First of all use a nylon string (such as a masons line or a chalk line). Stretch this along the outside edge of the slab to see of the original slab was poured straight all across the area where the wall overhangs the edge. Secondly repeat this test along the lower edge of the wall (outside) to see if the base of the wall runs a true straight line. And then third attempt to run the same test along the upper side of the wall (also outside). If the house is multi-story do this wall test along a point where the wall meets the second story. These three tests will quickly help you to determine if the overall structure was built correctly or not. There is always the possibility the the slab was built in a shoddy way and not straight from the beginning.

If by chance the walls are not actually sitting on a concrete slab that forms the floors on the inside of the house then there is a possibility of another serious problem going on. If the house wall is straight along the bottom edge and not matching to the foundation wall it may be that the foundation wall has tipped due to movement of the soil. If so then this needs to be looked into carefully.

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Thanks for all the info. The walls are sitting on a concrete slab. We will try all the tests you mention above. – Beverly Hudson Jan 16 '13 at 14:37
@BeverlyHudson - Let me add that after you do these rudamentary tests you will have some additional information to help in evaluating the situation with your house. If you add some additional details about what you discover, and maybe even some pictures, it is likely that some additional suggestions can be made. The goal of course would be to help guide you toward whether it will be necessary to get a professional contractor in to correct any serious problems. – Michael Karas Jan 17 '13 at 5:13

Checking if various lines are straight may help explain why there's an overhang, but the question remains: Is this a huge problem? I don't know if we can fully answer this, as the devil's in the details. Are there additional floors? Is this in snow country, if so what's the snow load? What are the wind and seismic concerns? Is the wall 2" off a bearing wall?

The bottom plate of the wall must have adequate bearing area on the concrete or the vertical studs could actually crush the fibers of the bottom plate. It may not be an issue for regular studs but beam supports are a big concern. Even good sized openings in the wall could be an issue.

Then there's the lateral concerns from wind and possibly seismic. The bolts or whatever anchors are used are probably all misaligned, with very decreased edge distances, significantly reducing the ultimate strength of the assembly.

What all this means is there is cause for concern, but depending on the design loads involved and their locations, it may not be a problem, or could be a huge problem. Without a detailed study, it will be very difficult to say.

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