It looks like a very typical RC soffit that hasn't been built to the highest standards.
There is evidence of a bit of grout loss on a shutter joint and the rust stains are probably the remains of tieing wire offcuts that weren't blown out before the concrete was poured.
Difficult to see how your flat is going to be affected directly unless the basement was literally full to the roof.
What do you mean by double slabbed?
There is evidence of a bit of grout loss on a shutter joint and the rust stains are probably the remains of tieing wire offcuts that weren't blown out before the concrete was poured.
Difficult to see how your flat is going to be affected directly unless the basement was literally full to the roof.
What do you mean by double slabbed?
