So I am getting ready to start a job where I will be building a new addition with a full basement onto a house that only has a crawl space. My questions is about excavating next to the existing house. I will be digging about 4' deeper than the existing foundation, and I am concerned about retainment of the existing wall. Has anybody done something similar to this? Do you have a particular way to retain the dirt and not undermine the existing foundation? Here is a detail off the plans to give you an idea.
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