Venting laundry drain

[grahamW]

I found a photo on the forum showing a laundry vent and figured I would copy it when doing my own installation. Alas, I don't have as much room between the p-trap from the washer drain and the sink rough in. In the photo attached, there is a dedicated vent for the washer drain that ties into the sink venting. Can I omit this vent if the distance is short, i.e. less than 16". All pipe is 2".

Thanks all.

 

[BMWpowere36m3]

The washer standpipe has a dedicated vent, because there is a fixture (ABS stub out between the copper lines) dumping waste into the vertical.

 

[Sponsor]

 

[hj]

I would NEVER install that secondary vent in an installation like that, nor have I ever done it. Now, the washer drain ABOVE the sink drain without a vent on the sink would be an entirely different situation.

 

[BMWpowere36m3]

I would NEVER install that secondary vent in an installation like that, nor have I ever done it.

That lower fixture (washer stand pipe) doesn't need its own vent? Aren't you technicanlly draining into the standpipe's vent if you do not install that revent?

 

[grahamW]

That lower fixture (washer stand pipe) doesn't need its own vent? Aren't you technicanlly draining into the standpipe's vent if you do not install that revent?

Yes, it would technically be a wet-vent if I omitted it. In my case, the ABS stub out between the copper lines which is dumping waste into the vertical would be for a laundry sink. It isn't a huge deal for me to shift the sink drain to the right and tie in with a separate vent.

For what it is worth, my current 'builder-quality' laundry uses 1 1/4" for drainage/venting and has a single vent down-stream of both the washer standpipe and the laundry sink. Looking at this is what prompted the question. Thanks all.

 

[Terry]

I would NEVER install that secondary vent in an installation like that, nor have I ever done it.

And your work would not pass inspection with a UPC inspector.
I don't know who your inspector is in Cave Creek, but he must be a lot nicers than ours.

Wet venting is reserved for "bathroom" fixtures on the same floor.
That's a laundry tray.

 

[Cacher_Chick]

The codes do vary from state to state. The vertical went vent for a laundry is permitted here where I am, but not in some other states.

 

[Terry]

The codes do vary from state to state. The vertical went vent for a laundry is permitted here where I am, but not in some other states.

You can vent the washer vertically, and that's normally what I do.
It's when you add a laundry tray to it that things change. The laundry tray should work in the real world being a wet vent, but if inspectors are going by the book, then no.

 

[Tom Sawyer]

IPC, you can drain the laundry tray into the washer stand pipe.

 

[Terry]

IPC, you can drain the laundry tray into the washer stand pipe.

Wow! that would make things easy.

 

[Tom Sawyer]

Yep, lots of head scratching and discussion when I run that past a group of plumbers getting their re-cert but it's clearly diagramed in the code.

 

[hj]

I have installed MANY washer drains with the sink attached to the vent, as a wet vent and NO INSPECTOR has ever rejected it. In fact, there is no reason why it should be rejected.

 

[Cacher_Chick]

This code excerpt is specific to Wisconsin, which reads similarly to some states, but not others.

a) Vertical wet vents. 1. Where 2 wall outlet fixtures are located on the same floor level with their fixture drains connecting to the same vertical drain pipe at different elevations, the lower fixture drain may be wet vented in accordance with subd. 1. a. to e. a. No other fixtures may discharge into the vertical drain pipe above or between the 2 wall outlet fixtures. Additional fixtures may discharge into the vertical drain pipe below the 2 wall outlet fixtures. b. A branch vent shall connect to the vertical drain pipe immediately above the higher fixture drain connection. c. The drain between the 2 fixtures shall be at least one pipe size larger than the upper fixture drain, but not smaller than 2º in diameter. d. Both fixture drains shall conform to sub. (9). The connection of the lower fixture drain to the vertical drain shall be considered as the vent connection. e. The higher fixture drain may not serve a water closet. Note: See ch. SPS 382 Appendix for further explanatory material.

 

[Terry]

I have installed MANY washer drains with the sink attached to the vent, as a wet vent and NO INSPECTOR has ever rejected it. In fact, there is no reason why it should be rejected.

Doesn't fly in Washington.
That's all I can say.
Show me in your UPC code book where it's okay.

 

[Tom Sawyer]

Yea, doesn't fly anywhere here, IPC or UPCUPC

 

[rick52768]

I have a similar question, but I want to see if I am reading this post correctly. Is the picture grahamW posted correct as it is shown (minus his want to omit the bypass vent)? In my situation the "floor drain" would be below the vent pipe entry point of the washer drain. See my attached amazing photoshop work. The "floor drain" gets some use from the following: water heater heat pump and pressure relief drain lines, HVAC heat pump drain line, water softener drain and overflow lines. BTW, what are the possible reasons to install a floor drain above the floor? Thanks

THIS IS WRONG TOO

 

[Smooky]

Rick,
That by-pass vent would need to be on the lower trap arm in your photo shop version.

 

[rick52768]

That makes sense now that you point it out. Otherwise the water from the washer would interfere with the vent for the floor drain. I am guessing that the bypass vent would also need to vent above the tallest standpipe which in this case is the washer?

 

[Terry]

You can't use the washer for a wet vent ever.
A washer will sipon traps below.
The floor drain needs it's own vent, revented 6" above the flood level of the highest fixture.

If the floor drain does not not water constantly keeping it wet, then a trap primer needs to be added.

If the floor drain is for a washer pan only, (machine overflow) then those are run seperate from the plumbing system and not connected.

 

[rick52768]

Nor would I want to use the standpipe for the washer as a vent for the floor drain. I think between the heat pumps (water heater and HVAC) that it should be okay as to keeping the floor drain wet or sealed. This bring up the a question I was wondering about unused standpipes. Is there a way to temporary seal a washer standpipe when you know it will not be used for a long period of time, but the rest of the fixtures will be used? I know there is the winterizing of traps which involves RV antifreeze. Is there not a rubber plug that can be tightened in place?