Minneaplolis Bathroom remodel

[EarlMat]

I'm in Plymouth, MN.
The situation is a Master bathroom, double vanity, and walk-in closet, plus a guest bathroom being remodeled. I have the master toilet running in-line with the guest tub. The Vent line is in the next joist bay over, but everything is open enough to move it if needed. The master toilet is against the outside wall, there is an interior wall that separates that area from the tub area, and houses the mixing valve and the vent. The tub is further toward the interior than the vent. Flow runs from the exterior towards the interior. I am having trouble figuring out how to route the venting to meet code and also vent these 2 fixtures appropriately.

 

[Reach4]

Do you have the path for the toilet waste in mind? If so, you can re-route the shower drainage downstream of the vent to join the toilet waste via a horizontal wye. Since you are UPC, that joining needs to be within 5 ft of the toilet.
Alternatively you could feed the vented lavatory drainage to join the toilet waste from above

I am not sure how big the pipe sizes need to be to do the wet venting of the toilet under UPC, but that can be a consideration. Diagram your proposal, and somebody can probably tell you the minimum pipe sizes.

This is called horizontal wet venting.

 

[Sponsor]

 

[wwhitney]

Since you are UPC, that joining needs to be within 5 ft of the toilet.

UPC limit is 6' of developed length from the toilet flange to the vent connection.

Cheers, Wayne

 

[EarlMat]

Thanks.
I’m trying to figure out how to vent the toilet and the tub thru the vent in the wall containing the tub mixing valve.
The toilets are 3”, shower and tub are 2”, and everything else is 1.5” (came with the house, upgrading as I go).

 

[Reach4]

Toilet flow is from top of photo to bottom of photo? If so, the wye is pointing the wrong way.

Or is flow bottom to top? What is in the pipe starting from the bottom -- waste from another floor?

 

[EarlMat]

That’s the existing vent. I’m discovering there’s no logical way to use it and still be to code. You can ignore that.
What if I put a 3x2 wye near the elbow under the toilet flange there, run a 2” line back to the wall, the up to the attic to connect to the rest of the stack?

 

[Reach4]

1. Which way is the flow thru the 3-inch?
2. Where can you drop the vertical vent?
3. What is traveling from upstream into the 3-inch pipe? If anything, you cannot use that pipe for wet venting. Venting has to be accomplished upstream of joining the other flow.

I think there may have been logical ways to use it, but they required another passage thru a joist.

 

[EarlMat]

1. The 90 elbow is directly below the toilet flange. Flow moves toward the interior from there, in the direction of the pipe.
2. There is a wall behind the toilet. There is a wall where the existing 1.5” vent is, I can put in any floor joist.
3. Perhaps I’m confusing the terms; I thought upstream meant the furthest away from the main stack, and downstream meant each fixture tying in along the way. The toilet is the final fixture. Then the tub. Then the main stack.

 

[wwhitney]

I’m trying to figure out how to vent the toilet and the tub thru the vent in the wall containing the tub mixing valve.

Not sure if it would fit well in the joist bay, or the vertical heights would work out, or if it would get your tub connection to the WC drain within the 6' of the closet flange that is required for having the tub wet vent the WC, but, in the direction of flow:

Tub waste and overflow drops into a p-trap (assumed 1-1/2", 2" would also be fine), probably rotate p-trap towards(ish) the WC, rotate outlet bend outlet away from WC (or at a 45 if preferable), hit a 2x1-1/2x2 horizontal wye with the 2" side inlet pointing upwards and back towards the vent wall for the vent, 45 the vent up into the wall, the 2" tub drain hits a 3x2x3 or 3x3x2 wye to join the WC drain and wet vent it.

Cheers, Wayne

 

[Reach4]

1. The 90 elbow is directly below the toilet flange. Flow moves toward the interior from there, in the direction of the pipe.
2. There is a wall behind the toilet. There is a wall where the existing 1.5” vent is, I can put in any floor joist.
3. Perhaps I’m confusing the terms; I thought upstream meant the furthest away from the main stack, and downstream meant each fixture tying in along the way. The toilet is the final fixture. Then the tub. Then the main stack.

1. What is the interior? I was thinking your 3 inch pipe was on an outside wall, but clearly a pipe along an outside wall does not have flow/from to the interior.. May I suggest that you put a bunch of letter labels on your photos to let us communicate unambiguously? Then you could refer to flow from B to C or pipe BC.
2. Behind? That means something to you.
3. Flow is upstream to downstream. Imagine standing next to a stream. Water flows downstream.
I thought upstream and downstream were much less ambiguous than to or from.