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...Water can be so dangerous... I would never let it disappear into the facade
There are many pipes in the walls of the house. Otherwise, all water pipes in the house would have to be surface-mounted. During our renovation, I also found that some downpipes, especially for the WC, are installed in the facade. In the bathroom upstairs, for example, the drain pipe runs across the front facade to the other side of the room because it goes down there into the small bathroom, where the toilet is connected (picture). After the renovation – we moved the toilet and turned it 180 degrees to the opposite side – it goes straight down there. Certainly, the original pipe is unfortunately still in the facade, but at least it is now dry.
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We suspended the ceiling on the ground floor so that a floor-to-ceiling shower could be installed above on the upper floor. This also allowed me to install LED RGB spots that require a slightly greater installation depth.
A downpipe should of course be maintenance-free if it is to disappear into the wall. Maybe that is also one reason?