Foundation sitting above footing?

[Mike Lamb]

What do you make of this? About 8 foot of the foundation near the two steel columns In this crawlspace has lifted/separated about a half-inch to three-quarter inch space between the foundation wall and the footing. There was no undue stress to the foundation or problems to the structure/floors above. There is a caulked foundation crack nearby but did not look anything out of the ordinary. 32-year-old house.

[Jerry Simon]

Settled footing.  Just saw one with over an 8" drop.  Like you said, nothing above suggested foundation movement itself.  (Foundation held in place by adjacent foundation walls, soil pressure, floor structure above.)

[Jim Katen]

I'd recommend grouting the gap. 

Either that, or insert several hundred more screwdrivers. 

[Marc]

2 hours ago, Jim Katen said:

I'd recommend grouting the gap. 

Either that, or insert several hundred more screwdrivers. 

Wouldn't it be safer to first try to determine if there are any dynamics involved? Such as clay deposits, for example?

[Jim Katen]

Are clay deposits a thing in Chicago? They're not really a consideration in my area. I always associate them with Texas. 

[Jerry Simon]

8 hours ago, Jim Katen said:

Are clay deposits a thing in Chicago? They're not really a consideration in my area. I always associate them with Texas. 

No.  Soil is full of clay more often than not in areas surrounding the city proper, but no expansive clay.

[John Kogel]

They put enough rebar in that wall to span the dip, I'd say. Grout is a good way to seal the gap. If it was my place I'd shove mortar in as tight as possible.