I have an old foundation left after demolishing a barn. It is located on a slope and has about 2.5M of "earth pressure" on one side (where I'm taking the photo from) and nothing on the other side. My plan is to cut off at least 1.5 meters of the wall according to the red line and build a new wall, then simply fill the space with macadam. The bottom here is an old slab, and the side with earth against it is not drained, so the idea is to build the new wall on a footing, drained, etc., and it becomes an L-sealed against the old stuff. The new wall, therefore, will be new on the outside but at the same time hides the remnants of the old one. On top of everything, I plan to build a small shed. Exactly how that construction will work with the foundation, I haven't decided yet, but that's another matter.
So the question is, what is a suitably over-dimensioned variant of this wall? My spontaneous idea is to excavate and prepare for a new footing x cm wide and set bent rebar into the footing sticking up about 60 cm into hollow blocks. Build with hollow blocks and tie new rebar that goes from bottom to top of the wall, filling the holes as needed. Place vertical bars in each course.
And sure, it might need to be calculated, dimensioned, etc., but there must be some guaranteed over-dimensioned standard I can use, right? If I do as I describe, I guess it will hold better than the old mess that has lasted all these years, but maybe it's overkill?
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