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Townhouse Sanitary & Vent

Townhouse Sanitary & Vent

Townhouse Sanitary & Vent

(OP)
I am working on a 4-story "stacked" townhouse plumbing design. For those who aren't familiar there are two, 2-story towhouses stacked on top of each other.

My background in plumbing mostly commercial.  I am stumped on how bathroom groups on each floor (not stacked) connect to each other without a main stack & stack vent.  

I cannot find one wall on each floor to line up.  

See link to my riser diagram.  It looks very unconventional to me.  I'm used to seeing a stack vent on the top of each stack.

Any thoughts?  Does this look right.

RE: Townhouse Sanitary & Vent

From 2006 IPC:  903.2 Vent stack required. A vent stack shall be required fbr
every drainage stack that has five branch intervals or more.

Looks like you do need a vent stack at the 1st elbow down.

Explain to the Architect that it is NOT good practice to route sanitary waste over someone's kitchen, bedroom, etc.  It could be a noise problem and worse if it leaks.  Send it to the Architect in writing as a CYA note.

Get the plumbing walls to line up.

RE: Townhouse Sanitary & Vent

(OP)
I don't have 5 or more branch intervals so why would IPC 903.2 apply?

Looks like you are a commercial engineer also.  If we would design the architecture, the homes would never sell.  Residential plumbers do what it takes to make it work.  After all, how many drainage & vent systems don't work?  In my 15 years as a designer, I can't tell you of any complaints (just HVAC problems).

RE: Townhouse Sanitary & Vent

Local plumbing codes all differ slightly.  If this was in my jurisdiction, the answers to the two balloons in the drawing are:
1. Yes, it's permitted
2. No, you don't require a vent at that location
However, the shower on the top floor is not vented to code.

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