Basement Bathroom Install

[sszakats]

I am adding a bathroom in the basement and am getting ready to cut the cement for all my drains. I am installing a below floor pump/container that will collect and pump up to my sewer line.

My question is, where do I locate these cuts/drains? My layout is as follows (from left to right, all on the same wall): toilet, sink, shower. The tank can be located anywhere immediately behind this wall. Should I create a trench behind the wall which T's into the tank, and T's under the wall to the toilet and the shower? Can I drain the sink into one of these 2 drains without creating a separate T trench?

What is the best method for cutting these trenches?

Thanks, Steve

[Wgoodrich]

YOu should use one 4" pipe from the sewage lift pump pit to the wall then install a 2" Tee up just outside that wall pointing straight up out of the floor. This must be a vent. You may use a ventless adapter that is a flapper style adapter that will allow are into the drain pipe to stop suction that would suck your traps dry which would allow sewage gases into the room. You would be better served if you can run that vent up and through your roof using an adapter increasing to a 3" pipe going through your roof for an antifreeze design that is required when leaving the house to the outside.

You should then glue a 4" pipe beyond the vent Tee heading toward your toilet. Then install a 1 1/4" Tee and better yet a 1 1/2" Tee to go to your vanity drain. Then continue your 4" drain toward your toilet and install a 2" Tee heading toward your shower drain. Then continue on with your 4" drain pipe to your toilet.

No trap is needed at the toilet. The toilet has a trap inside the tiolet.

Under the shower you will need to install a trap for the shower

Under the vanity sink you will need to install a trap for the vanity sink.

To cut your trench it is best to use a cement cut blade on a worm drive type power saw to cut two slices wide enough to install your 4" drain pipe and install your bathroom drains. Once you have cut two slices in the concrete a few hits with a sledge between those two cut slices will break out your concrete floor without damaging your existing concrete floor.

Hope this helps

Wg