I am in the process of adding an addition along side of a 1950 vintage 2 story brick house. Upon excavating down to the footing, it was discovered that THERE WAS NO FOOTING! The concrete blocks were set upon a bed of mortar sitting directly upon a clay subsoil base. (Western PA area) My first instinct was to dig out and underpin the exposed area of block with concrete. Now that I think about it further, will I cause more problems? I should point out that the wall has no settlement cracks and that the new footing elevation is even with the bottom of the old block.
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