My house is four stories, and every floor/ceiling is 14 inch thick steel-reinforced concrete resting on heavy steel beams. I cannot get a portable phone signal to reach from one floor to another.
The foundation was set on bedrock, three meters below ground level. I have had no problems with tile and floor flexing.
tanstaafl.
I once had to wire a building in London similar to yours. We ended up running cabling out an upstairs window and back in through a downstairs window. Far (far!) easier than punching through the floor.
-jk
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