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Different use case but I used this stuff to patch a porch overhang: https://www.toupret.co.uk/professional-filler/product/exterior-surfaces/masonry-repair-filler
No max depth. So I don't think you'd need expanding foam. Just pack it in.
I guess there's also a wider question as to why this has occurred?
hugo7-
I guess there's also a wider question as to why this has occurred?
If you were asking questions you could also ask why there's a 70mm drop in floor level ('level') from one end of the studio to the other. My answer would be that the previous owner's threshold for 'good enough' is considerably lower than mine.
6pt
I’ve got some French doors around which we are seeing moisture ingress/damp. Inspection immediately reveals why. Am I right in thinking fill with some kind of expanding foam, cut back, mortar over the top? Gap is about 55mm deep, goes up to 8mm at its widest. My usual DIY approach is to pay someone to do things, please instruct me in the simplest possible terms.