Originally Posted By: Joe This post was automatically imported from our archived forum.
I did an inspection yesterday, and found one of the foundation blocks deflected outward from the structure, and cracking away from the other blocks.
The image that I have doesn't do it much justice, and I apparently need practice before uploading. The deflection starts at the bottom of the block and gets worse as it goes toward the top of the block- the block is even with the others at the bottom, but is pushed out by 3/8" or so at the top.
I called it out as a possible foundation fault, and recommended a foundation contractor with licensed structural engineer consult.
My question: any idea what caused it? The wall in question is a basement wall, there is no interior damage, nor any sign of why this single block is like this. The basement is finished, so I can't see the actual foundation wall. My suspicion is that a beam has shifted or expanded and applied lateral pressure to the block.
Originally Posted By: roconnor This post was automatically imported from our archived forum.
It’s hard to guess at what’s going on without an investigation which would provide other clues, but one possibility is that the entire block wall might be moving/deflecting inward.
It sounds like this might be happening at the middle of a shorter end wall of the foundation, which would make sense. If there isn't adequate lateral support and attachment of the framing and joist blocking to the top of the wall, then it would only be supported at the ends and the center girder, which usually isn't enough support ... particularly for longer end walls. So as the wall deflects inwards, that single block may be pushing against the girder which doesn't move, and therefore pushes the block outward.
Good call for further evaluation, as that goes beyond a home inspection. Keep in mind that an issue like this requiring evaluation usually should be referred to an engineer, while maintenance/repair items are usually referred to a contractor. Contractors should no be doing evaluations.
Just my 2-nickles as an engineer also ... 
-- Robert O'Connor, PE
Eagle Engineering ?
Eagle Eye Inspections ?
NACHI Education Committee
I am absolutely amazed sometimes by how much thought goes into doing things wrong
Originally Posted By: Joe This post was automatically imported from our archived forum.
Thank you for your reply, Robert. Inward deflection is something that I hadn’t considered. I’m anxious to find out what the engineer has to say on this.