Hello!

Planning a bathroom located in one corner of the lightweight concrete house on floor 2 (new construction). Without knowing the best way to run the drainage, I think it should be connected to the bathroom downstairs on floor 1, creating a stack going down through that bathroom and out of the house through the slab.

This means I would need to embed about 6.5 meters of drainage pipe in the intermediate floor. Considering that you should have a 1 cm drop per meter (right?), I'm now considering how the slab's thickness, design, and cost will be.

I have considered casting the floor with composite decking. How thick would the floor need to be to handle this?

I've also looked at floor elements from for example Bauroc but I'm not entirely sure how to handle drainage integration in such a system. Any tips?

Do drainpipes have to run through wet rooms, or can I easily build a small shaft elsewhere in the house to lead down the drainage?

If you were faced with this problem, what would your recommended solution be?

Grateful for help!
 
Åsa Lund
Place a drain stack at a different location in the house. Do not run a long pipe in a joist if you don't have to. It can cause a lot of blockages in the future.
 
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