I am working with a major track builder who is having a problem a small vertical crack (approximately 1/64th inch) form from the top of the foundation to under the bond beam. The homes are 2-story. The 1st floor is masonry and the second floor is wood. The wall section is approx 40' long. What is the probable cause?
The most likely cause is normal block shrinkage. Standard control joint spacing would call for a control joint about mid way in your 40' long wall. Sounds like mother nature has taken care of supplying that. You also might check for aggravating circumstances such as an interior partition at approximately that location with a vertical row of fasteners.
If the crack is the same width at the top as at the bottom my guess is that it is not caused by settlement.
Jerry Painter, FASTM
Don Beers, PE, GC
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