Please critique my DWV plan

[Nick Bosco]

This plan is for a bathroom next to a laundry (WM=washing machine). Thanks in advance

 

[Plumber69]

You dont want washer machine dumping before shower, can you make it the last fixture on the 3 inch

 

[Sponsor]

 

[Plumber69]

You dont want washer machine dumping before shower, can you make it the last fixture on the 3 inch

you will need to vent it

 

[WorthFlorida]

Is this first floor or second floor? Vent for the WC is not correct, vent the WM, the double sink can be one drain and vent for simplicity. See "Toilet rough in" page in the PDF document. Since I'm not a plumber, I'm not sure about the shower drain. If you have the space it never hurts to vent every fixture separately.

https://www.co.lincoln.or.us/sites/..._-_helpful_hints_residential_construction.pdf

 

[Nick Bosco]

This is on a second floor and the vertical 3" drain and vent are existing. I was trying to follow this guide on wet venting the WC and believe I have through the double Lav.

I can make the laundry it's own branch so it doesn't run by the shower, but I'm not sure I can make it the last thing.

 

[Reach4]

I am not a plumber. The two lav drains should connect to a double fixture fitting, or use two santees and split the vent 42 inches above the floor. Then join the drains.

WM trap arm needs a vent, even if the vent is an AAV.

WC vent is may not be not needed if you drain the WM drain downstream of the WC wye. I am not sure.

Any transition from vertical to horizontal should be done with long sweeps.

https://www.co.lincoln.or.us/sites/..._-_helpful_hints_residential_construction.pdf may be useful to you.

 

[Nick Bosco]

added vent to standpipe

 

[Terry]

The washer comes in last, or the toilet is no longer vented.

No washer can be included in a single story wet vent. It's a pumped fixture.

As far as the stack there, at the point where it goes down to the next floor, it can only be a waste stack.

The horizontal fittings are wyes and combos.
Long turn 90's and 45's on the changes of direction.

 

[Nick Bosco]

Thanks Terry. The 3" stack and vent are existing. I've moved the washer downstream of everything and will follow table 706.3 for all my fittings.

 

[Reach4]

I think the 3 inch vent then becomes not required, but it may be a good idea anyway.

I don't know about the cleanout requirements. I am thinking one above or below the sink would be good.