Frequently, it happens with renovation as well as with new building that 7cm thick partition walls are utilized, which are affected in their stability when a common drainage pipe is laid in (which has to be at least a 4 to 5 cm deep slit that must be milled in the wall). How badly the wall is affected in its stability depends on the state of the wall. With renovations, the deep slit could cause damaging of the wall of the neighboring room.
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