I am working on a 1920, 2-story balloon-framed addition with 9" thick brick foundation that is 30" deep. I want to pour in 60" high underpinning sections for a total wall height of 7'6". There will be 6' of dirt cover outside. The sections will be 3' wide and 20" deep. The sections will also have a footer that is 12" high and 30" front to back. The footer will be poured monolithic with the wall sections. No rebar. Each section will be formed with a "bird mouth" ramp set higher than the brick-to-concrete connection so I can vibrate the concrete to conform perfectly to the brick. I am wondering if all that sounds OK and what I should change. Engineer says I need a bunch of vertical and horizontal rebar, but that the walls are plenty thick.
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