How's this for a DWV setup?

[hmmdinger]

Hello all, great site here.

I am replacing the plumbing for a bathroom on the main level of my house. Before I actually begin the DWV piping, I was hoping to find out if it is as simple as I have shown here.

The vent behind the sink is intended to be 3". The sink and tub have 2" draining downwards toward the toilet, then a 4" would drain about five feet over to the stack.

I edited this diagram from another one, so understand it is rough. At this point, I am mostly wondering if there are any big issues with this plan I haven't considered.

Thanks!

 

[hj]

layout

Your first problem is that you cannot use a "4 way" tee at the toilet connection.

 

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[Dunbar Plumbing]

I hope I live close by because you'll keep my drain cleaning motor warm with that configuration. Turn that 4-way to a tee, go below and cut in a double wye and you'll be fine. Good artistic drawing though, I wish mine were that good.

 

[Plumguy]

I think it is not as "simple" as installing a "4 way tee". However, a double estabrook might fit into the picture.

 

[hj]

tee

If your double "eastabrook" is what they call a double inlet "Wisconsin" tee here, and a double inlet cottage tee in Chicago, then not all inspectors will approve it.

 

[Plumguy]

I'm not familiar with those names. An estabrook is basically 3" ty with a side oulet. 3" picks up WC, side outlet picks up tub/shower and then a 3x1 1/2 ty is installed above for the lav. It just makes stack venting a bath a little easier. Actually, looking at the picture again a double wouldn't be necessary.

 

[Terry]

The bends on the lower end don't look right.

They should be long turn 90 el fittings.
The fitting where the toilet is could be a santee fitting, and then below that you could use a sancross for the lav and tub to drop in below.

 

[hmmdinger]

First off, I REALLY appreciate the advice so far. It's incredibly reassuring to have this resource available.

I have edited my diagram, based on what I THINK everybody was talking about. Kind of seemed like different options were presented, though, so I might be off.

Another additional question I have is where might be the best location for a cleanout?

 

[Plumguy]

If the piping is accessible then I would install a cleanout on both the lav and bath drain. Here toilets are considered legal cleanouts but it is certainly easier if there is a cleanout below.

 

[SRdenny]

The wc has no vent. Make the 4 way fitting below wc a double combo and make the fitting above it a tee with it's riser tying into the horizontal vent above with a cross and carry the vent strait up from that point of connection. BTW: What program did you use to draw up your diagram?

 

[hmmdinger]

My problem with venting the toilet immediately is that my fixtures are against a wall running right on top of a tripled-up 2x8 joist...can't go through it. I was actually going to bring my vent up through the vanity cabinet's base and angle out it's back into the wall to go up through the roof. I also have some extra space where my tub/shower lines are because I had to build in an alcove and put the extra space on that side of the room.

I have seen examples where the toilet is not vented straight up behind it, so I was hoping to vent it elsewhere myself.

As for my diagram, I wish I knew a program that could do this. One may exist, but in this case I actually used Photoshop to edit an existing image I found on this page:



It seemed the closest to what I was trying to do, so I hoped for minimal editing to get what I needed.

 

[Jimbo]

In this last picture you posted, the toilet is properly vented. A vent should tie in on the waste arm, that is the pipe that runs from the trap to the actual main drain. On your first picture, the toilet connects directly to the drain; it only achieves a vent back through the lav or tub waste line. I believe no code would allow this.

 

[SRdenny]

"My problem with venting the toilet immediately is that my fixtures are against a wall running right on top of a tripled-up 2x8 joist...can't go through it."
Head off the 2x8s. Engineers and or carpenters who put multiple joists below plumbing walls are idiots.

 

[Plumber1]

drain set-up

I wouldn't want to try to clean drains with that configeration.
I realize that this is just your diagram, but all drains need to be wyed in the direction of flow.

 

[Terry]

I prefer plumbing more like this.

 

[hmmdinger]

Thanks for the diagram. I am only plumbing one floor, but I see how everything is working. My main problem is still that my plumbing wall sits right on three joists. I did have to build an alcove to fit the tub, though, so I was thinking my main stack could run inside that, with a sink vent coming into it through the wall studs.

In this version, I think I have the tub and toilet venting at the same level directly into the main stack. The sink has it's own vent, because I can angle into the wall behind the cabinet above the floor joists.

Take a look...anybody here on the weekend?

 

[Terry]

You don't really have the toilet vented right the way you did it.
You're thinking of the first drawing at the top of the thread, which no plumber would be allowed to do.

Something like the upper bathrooom in this picture would be better.
You could wet vent the lave into the toilet vent if it's on the vertical.