Hey Tom/speedball,

I saw you had answered a question online regarding some basement plumbing and I had a few questions myself.

I dug a trench and hole for my basement as the image will show. I was curious as to what I will need to do to ensure things are properly vented and sized. I want to say the main line is 3" but maybe 4" regardless here goes...

Shower - What size is doable? Should this use a buried or sub foundation level P-Trap? Is there a danger in burning this P-Trap to far? A scenerio in which water weight couldn't force the water out?

Sink - Seems pretty standard as it's above ground.

Toilet - Is there such a thing as a directional Tee?
Seems from what I've seen the Tees curve in a certain direction.
Is this what I should use to prevent flow in the wrong direction?
Is there such a thing as a check valve like set-up I should put in the main prior to the toilet connection?
Doesn't the toilet have it's own built in P-Trap?

Do you see any problems in my drawing there?

Any help would be fantastic!!

Cheers
-brian-

Hi Brian,


(1) Shower--What size is doable? Should this use a buried or sub foundation level P-Trap?

2" pipe and "P" trap. trap's buried underthe cement and a 2" raiser brought up through the cement to pick up the shower drain. The shower drain wi8ll connect to the lavatory drain and be wet vented.

(2)Sink - Seems pretty standard as it's above ground.

Except you will run a vent to the roof off the 2 X 1 1/2" tee you pick it up with.

(3)"Toilet - Is there such a thing as a directional Tee?
Seems from what I've seen the Tees curve in a certain direction.
Is this what I should use to prevent flow in the wrong direction?
Is there such a thing as a check valve like set-up I should put in the main prior to the toilet connection?
Doesn't the toilet have it's own built in P-Trap?"

All drainage fittings direct the flow. You will be using DWV fittings.
No check valve's are needed in the drainage system.
The "P" trap's built into the toilet.
The slope is 1/4" to the foot.

You do realize that you're getting into major surgery here don't you? You'll need plumbing skills and knowledge to add a bathroom group from scratch.
You may want to pay a plumber to come in and lay the job out and give you a material list. Lots of luck, Tom