Plumbing two new bathrooms one above the other and then to main stack?
I am adding a half bath on the first floor and a 3/4 bath on the second. They are stacked above and below each other. It will be all new plumbing on the left side branch of my drawing. Do you see any problems with my venting of the two baths together using a 3" stack? What fittings are necessary for the connections on each floor?
Horizontal distance from new stack (on the left) to main(original) CI stack where I will tie in is about 7feet. The new WC on the second floor will be about 3feet from the new stack so horizontal distance will be right around 10 feet total after all the drop.
Long sweep at bottom of new stack with cleanout wye above?
Sinks=1 1/2", shower 2" and "3 inch for stack and WC to the basement.
Venting the shower upstairs
See my options for venting the shower a couple posts below.
New questions and new drawing
Going back to the original drawing to work things out. Thank you hj for steering me away from the albatross.
Shower connection options?
1.Use a combo sani-T hub 3x3x3x2 (would simplify things). Stack acts as vent for the shower.
2.Use a vented branch to a 3x3x2 sani-t. Venting required for the drop to get below the wc connecting sani-T.
3. Connect shower to lav waste via a Y fitting and add 2" vent near connection to3" Y between WC and stack vent. (Tie into WC 2" vent or into stack on its own?)
Project photos for reference
The projects are in the garage and the bonus room above the garage utilizing a dormer area for a shower. The proposed 3" stack location is firm. The space above the stack in the kneewall is 50 inches tall. I can route it up the rafters to exit above the dormer valley. It lines up with vertically with the proposed bathroom wall below and the route to the basement to tie into CI stack. Nothing is framed on either floor, hence some flexibility. The hole through the poured concrete foundation on the first floor has been cut to access the CI stack in the basement.
Here are some pics for reference.
Attachment 18497Attachment 18498Attachment 18499Attachment 18500