ᐅ Sewer pipe under the slab or next to it?

What is the common practice for wastewater management in new construction?

If a toilet or bathroom is installed on the lowest floor, do you need to run the wastewater pipes beneath the slab or (due to slope requirements for drainage)?

Thierse schrieb:
If a toilet or bathroom is installed on the lowest floor, you have to run the pipes underneath the floor slab, right (because of the wastewater slope)?

Yes.

Thierse schrieb:
What is the usual procedure for wastewater in new builds?

If a toilet or bathroom is installed on the lowest floor, do you have to run the pipes below the slab or (because of the wastewater slope)?

Of course. This doesn’t depend on the lowest floor, unless you wanted to drain a toilet on an upper floor through an external wall. The entire system should, of course, also be frost-protected.