Main stack questions

Sephy

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MI, USA
Following online diagrams to plumb:

Washing machine + utility sink [2” branch]

Bathroom: toilet + sink + tub [3” branch]

Kitchen sink NO D/W (no pic, just vtr w/ 1 1/2” around the window) [2” branch]

(All the branches in my own pic will be redone) (All vtr branches will attach to the 3” main drain/vent w/ upside down sanitary tees in the attic before it leaves the roof) (IPC but really just need it to work efficiently)

Questions:
How do I connect each of these branches to the vertical main stack? I know to use sanitary because they go from horizontal to vertical & to do 1/4” drop per foot on the branches.

1. I would *like* to do a 3x3x3x2 sanitary tee with 2” side inlet accepting the kitchen sink and the 3” accepting the bathroom’s branch. Is this ok?

2. Where should I attach the 3x3x2 sanitary for the washing machine + utility sink? Above or below the bathroom sanitary tee on the main stack? In the side inlet instead of the kitchen sink (that’d be too much, right?)?

To complicate matters, I would really like to add a wye where the pink circle is on the bathroom plumbing pic, approx 7’ from the toilet and 8’ from the main stack. The side-lying wye would accept a 3” pipe with waste from an upstairs bathroom, configured exactly like the lower bath.

3. Is that ok?

Thank you for any help I can get!!
 

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Last edited:
The utility sink may be a violation in your area.

In NYC, we have to place a vent within 2 feet of the trap and the trap within 2 feet of the fixture

Move your vent closer to the trap

Also, get rid of the Ferno coupling and buy a shielded coupling like a Mission coupling
 
Assuming that the santee connected to VTR gets a lavatory trap coming in, your bathroom group picture is OK.

Q1. Not sure what you are asking. Would be OK if the top of the santee was a dry vent, OR if the kitchen trap is already vented.

Q2. Are these already vented? Then order will not matter. If you are looking to do vertical wet vent, you want a picture/sketch that matches your proposal.

Q3... zoning out by then... so let's figure out 1 and 2 first.
 
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