Does washing machine need (another) vent?

[auntnana21]

Remodeling a 1950's home. Washer was in the kitchen beside the sink so I opened up a pantry in the kitchen for a small laundry. When I installed the new kitchen sink I installed an AAV for it. It's about 6' before the washer. The original vent stack in the bathroom is about 10' after the washer. When I moved the toilet about 5' from the vent stack, I installed an AAV for it also since it's now on a separate branch into the main cast iron going out to septic. Kitchen sink, washer, and original stack vent are on same branch going into main cast iron. That's all the plumbing with drains - 1 bath, washer, kitchen. Will I need an additional AAV for the washer or should what I have already work?

 

[Reach4]

The AAV is to prevent the trap from siphoning out. You will need a new vent, such as an AAV, for the new standpipe trap.

If you diagram what you will have, people could take a look. But it is pretty probable that a WM standpipe will not be permitted to share a vent with the kitchen sink or bathroom stuff.

 

[Sponsor]

 

[auntnana21]

This is rough but complete for anything that has a drain. Before I started renovating, everything was using the one vent stack and the washing machine connected into the kitchen drain.

 

[Reach4]

As drawn, everything needs an AAV.

Run the bathroom sink drain to join the shower and toilet waste before the they join the washer kitchen waste, and then the shower and toilet would not need an AAV.

 

[auntnana21]

It would be impossible to route like that. I think my drawing is misleading maybe. Don’t know if it makes a difference but It’s a view from above. All the lines are parallel to the floor, not vertical. The black line is my cast iron outlet parallel to the floor with a hub/bell where each blue line joins then 90s out to the septic. At the end of each blue line is where it would 90 up through the floor as does the vent stack.

 

[Reach4]

Don’t know if it makes a difference but It’s a view from above. All the lines are parallel to the floor, not vertical. The black line is my cast iron outlet parallel to the floor with a hub/bell where each blue line joins then 90s out to the septic.

A vent stack normally implies vertical. Maybe make your sketch with the vertical stuff green or some other distinctive color.

A better way is to diagram where the stuff is, from above, and mark the drain line out with a circle, and similar with the vent.

To wet vent a bathroom group with the lav, kitchen waste must join bathroom waste downstream of the wet-vented bathroom stuff. No non-bathroom stuff joins upstream of the bathroom stuff.