The cracks were most likely as a result of combination of: badly prepared foundation footings, blasting on an adjacent building lot to prepare that site for new construction, and possibly omission of steel reinforcement in the poured wall
As movement appeared to be continuing over at least a year, the builder might have repaired the foundation by supporting it from below using one of the methods
An in depth conversation and instance of repair techniques for foundation settlement or “vertical foundation movement” fix is supplied at Vertical Foundation Movement Fixes where we clarify and illustrate various techniques to arrest foundation settlement, where suitable, to boost or level or reinforce settling or moving foundation walls or foundations.
The motive for just about any decision to bolster a structure foundation rather than rebuild it might be easily understood by realizing the real difference on price between bolting a few vertical steel beams with a building or developing a pilaster and also the cost to incorporate temporary support for the flooring above, remove a present foundation, and rebuild an alternative instead.
Nevertheless the choice to support or reinforce the groundwork wall versus repairing it’s frequently made by the wall itself. When the quantity of bulge or bow is sufficiently severe the wall should be reconstructed.
Once the underlying way to obtain wall damage can not be dependably addressed without digging up outdoors to incorporate drainage and perhaps water proof, there’s additional motivation to do a more pricey repair.