Advice on re-piping washer and utility sink

[parity_check]

Hello all,

Please forgive all of the chaos in the picture. I am trying to replace the galvanized steel shown here with PVC. The current pipe is old and sometimes overflows when the washer pump runs. The problem here is that the stand pipe is in the ground and I want to move it back 6 inches into the wall to install a washing machine outlet box. That means the vertical run needs to be above that sill/beam against the stone wall.

I do not want to mess with the vent, I would just couple it to the new pvc.

Btw, I know someone will ask why the electric is run that way. I had nothing to do with it, but it is supplying a sub panel in the garage on the other side of that stone wall. I am only here a few years and trying to bring things up to code.

Any advice on how to go about this is appreciated.

Thanks.

 

[Breplum]

bring it up to modern standards by running new 2" up into the house and also, that is where the p-trap goes.

 

[Sponsor]

 

[John Gayewski]

P trap and vent go above the floor.

 

[parity_check]

bring it up to modern standards by running new 2" up into the house and also, that is where the p-trap goes.

Does the washer stand pipe need a trap also, or just a cleanup at the bottom? Where would that go, in the wall above the floor?

The vent runs outside then vertical to 6' height.

The sink on the right has an s-trap on the vertical pipe above the floor under the sink. Will replace with p-trap.

 

[parity_check]

Sketched what the plumbing would kind of look like if moved to walls. 2 more questions.

Is vent like this ok? The pipe is outside and is taller than the top of the standpipe.

Does the sink need it's own trap?

 

[John Gayewski]

Sketched what the plumbing would kind of look like if moved to walls. 2 more questions.

Is vent like this ok? The pipe is outside and is taller than the top of the standpipe.

Does the sink need it's own trap?

No. The vent goes above the p trap. There are plenty of diagrams that show a proper configuration.

 

[parity_check]

No. The vent goes above the p trap. There are plenty of diagrams that show a proper configuration.

what about this. i have to use 2 45’s to bend the pipe behind the sill plate to get the pipe in wall

 

[parity_check]

sink would have a trap not shown

 

[John Gayewski]

sink would have a trap not shown

The sink should go to the washer standpipe. If you have to traps the drain would need to be 3"unless you move the sink above the laundry then it could be 2",but it's usually easier to drain the sink into the standpipe.

 

[Reach4]

sink would have a trap not shown

Sink would need a vent and a trap. But if you can do this, you need neither for the sink:

 

[parity_check]

Looking at the original photo I posted, would the sink technically have a vent? I think that is categorized as a wet vent, but is that design valid if I just replicate with new PVC?

 

[Reach4]

Looking at the original photo I posted, would the sink technically have a vent? I think that is categorized as a wet vent, but is that design valid if I just replicate with new PVC?

It is not a wet vent of the standpipe trap; I think it is a horizontal dry vent. Neither horizontal wet vents or dry vents are allowed for a standpipe under IPC.

But it gets worse. In the US codes, including IPC, under-floor traps for a laundry standpipe are not allowed. I am not saying that replacing your steel with PVC won't work, but I am saying it will not meet code.

The sink needs a vent, and I presume that there is a vent at the trap for the sink.

 

[parity_check]

ugh. i don’t wan to do all this work and still not be compliant. here is a picture of the vent. can i just poke a new hole and put a vent there? going through the roof isn’t an option as there is another level above.

 

[John Gayewski]

No the vent can't go there. Needs to go out thru the roof most times as it came be by a window or any air intake.

 

[parity_check]

No the vent can't go there. Needs to go out thru the roof most times as it came be by a window or any air intake.

I'm not having any luck here, no wonder the last owner didnt attempt to fix this,. This part of the home has a flat roof. What if I just run at outside above the roof far enough away form any windows?

 

[wwhitney]

What if I just run at outside above the roof far enough away form any windows?

The following option from the IPC may be of interest to you:

903.1.4 Sidewall Vent Terminal

Vent terminals extending through the wall shall terminate not less than 10 feet (3048 mm) from the lot line and 10 feet (3048 mm) above the highest adjacent grade within 10 feet (3048 mm) horizontally of the vent terminal. Vent terminals shall not terminate under the overhang of a structure with soffit vents. Sidewall vent terminals shall be protected to prevent birds and rodents from entering or blocking the vent opening.

Chapter 9 Vents: Vents, Virginia Plumbing Code 2021 | UpCodes

UpCodes offers a consolidated resource of construction and building code grouped by jurisdiction

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Or under the IPC you could use an AAV, assuming you have at least one other vent through the roof on the rest of your DWV system. The AAV would be accessible indoors, and you'd abandon your existing sidewall penetration and outdoor vent.

Cheers, Wayne

 

[John Gayewski]

Yeah you could run it out the side and up over around the eve.

 

[parity_check]

Yes the system has a roof vent off the main branch. So I can just add an AAV? That is a game changer.

 

[parity_check]

Someone posted this picture online. Is this valid? The sink would be exactly 30" from the laundry drain. It looks like the AAV should be taller than the stand pipe?

 

[John Gayewski]

Someone posted this picture online. Is this valid? The sink would be exactly 30" from the laundry drain. It looks like the AAV should be taller than the stand pipe?

Aav's are legal in the ipc. The manufacturers don't require they be more than 4 inches above the trap. Some municipalities require them to be above the flood rim of the fixture which would be above the washer or sink whichever is higher.