I am starting a project that involves a rebuild of a house destroyed by fire. The owner is hoping to reuse the existing foundation but wants to add a second story to the new house. The existing foundation is a crawl space, but rather than a typical footer and stem wall, the wall is a single triangular pour that tapers from app 8 inches at the top to somewhere between 12 and 18 at the bottom. The house was built in 1915 but according to county records, a remodel was done in 1946. The foundation appears to be in very good condition, which suggests that perhaps it was poured as part of the 1946 remodel? Has anyone ever seen this type of footer/wall? Any idea in which years it was common and whether or not it likely has rebar in it?