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I want to drill a tiny hole from the bathroom into the next room. This wall has a sink and shower attached. On the other wall of the bathroom is a toilet and bath tub. Above the bathroom is another flat, which I assume has the same layout as mine. So above should be a bathroom as well (which I can acoustically confirm). I guess I share the drain with the above flat, which means my target wall most likely contains a drain going vertically from top to bottom, unless there's only one drain for the bathroom and it's on the toilet side. I guess this drawing makes the layout more clear:

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I have this scanner to find electricity and water pipes, but drains are non metallic. How can I make sure not to hit the drain? The flat is in Germany.

The wall is most likely a brick wall. That's at least what I found in the kitchen. I didn't drill anything there yet, so I don't know the dust color. But the wall doesn't sound hollow.

  • It would help to know why you want to do this. You're asking how to perform a specific solution, but if we know the problem, we might be able to find a better solution entirely. That aside, why not drill from the bathroom side? – Hari Ganti Mar 1 '17 at 23:36
  • I would drill from the bathroom side. I just painted it on the other room to make clear that the hole could be anywhere on that wall. I need that hole to put a wire between those two rooms. – Markus Malkusch Mar 1 '17 at 23:43
  • Again, why do you need to put a wire between the two rooms? It would really help to know what you hope to accomplish. Also, if you drill from the bathroom side, you should have some idea where the drain is, given you know the sink location. – Hari Ganti Mar 1 '17 at 23:44
  • I need a LAN connection between those two rooms. Wireless is no option. Well, I know where the sink is and I know where the shower is. Other than that I have no idea how this is layed out inside of the wall. My best guess would be it's between both of them. But that's only me guessing. I'm asking here for a more reliable method. – Markus Malkusch Mar 1 '17 at 23:49
  • Sorry, you still don't seem to be understanding me. I'm asking why you need a LAN connection to the bathroom. Are you installing networked speakers? Do you want a smart TV? Do you just want to surf the web with ridiculous throughput to pass the time? – Hari Ganti Mar 1 '17 at 23:52

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