I am setting up an interior wall to build a bathroom, planning to install a framework, and I have 90 mm studs. One issue is that the vent pipe for the drainage is meant to go in a wall, and I planned to enclose this with a vent valve and a sort of access panel for potential maintenance. This pipe is 105 mm, so that wall has to be thick, or alternatively, it can create a bulge on a thinner wall. Yes, the latter is just something someone might have an opinion on. The main question is, do I need a sill? The slab is quite thin over the insulation, I would estimate 2 cm, so it will drill into the Styrofoam. In the ceiling, I will fasten the studs with wood screws. There is also a truss to fasten against under certain ceiling planks.

How would you approach this?

Regards Marc
 
If you are going to have the ventilation built-in, you need to consider not only the pipe's dimension but also the vacuum valve, which usually has a larger diameter than the pipe.

It sounds difficult to build a stud wall on a concrete slab without using a sill. Why do you want to avoid it?
 
Thanks for the response, reason for the question about syll, this is completely indoors, and I'm unsure about drilling in the slab, I think it's quite thin, and expansion nails, I thought PL400 glue might be simpler, but glue with syll? How do you do that? Yes, I agree that the vacuum valve will be larger than the pipe. I'll have to check out the models.
 
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