2nd floor addition new bath plumbing questions

[MadScientist]

I am adding a second floor with a bathroom to my house and i have some plumbing questions.

1. Can i jog the main 3" vent at the 45deg angle.
2. Is the horizontal section under the floor wet vented?
3. Can i put the tub after the water closet.
4. do i need a vent for the tub

1. Diagram
https://drive.google.com/file/d/1q4Q3M4aCzJsTdc066LOivP4ROCnV1l4G/view?usp=sharing

2. Downstream to upstream
https://drive.google.com/file/d/1q0o-TRhNAymZR6y1_KNu_GqVvgAsAYV2/view?usp=sharing

3. underneath
https://drive.google.com/file/d/1q06UVRBwDfPzSGPqXRPEP1gcOcPjBfld/view?usp=sharing

4. upstream to downstream tub and vent
https://drive.google.com/file/d/1pyY_WK0-y227wXiGVG_AV9-E5kzAkoql/view?usp=sharing

5. upstream to downstream tub and vent and wc
https://drive.google.com/file/d/1q2XSctNH7dtjUV_JRkDiUg_Ga4X1BP13/view?usp=sharing

 

[wwhitney]

It's a bit hard to follow your diagram and differentiate between vertical and horizontal. A few comments to start, not exhaustive:

- MN uses the UPC per up.codes. Under the UPC, a vent takeoff from a horizontal drain line has to be a wye or combo rolled up at least 45 degrees from horizontal, not a san-tee on its back.

- The kitchen sink drain needs to be 2" minimum (1-1/2" trap arm to a san-tee is OK). It appears you are vertically wet venting the 1st floor bathtub with the combined lav and kitchen sink. That's OK if there's no horizontal wet vent involved, but it means the vertical wet vent has to be upsized to 3" (well, 2-1/2", but that's not commonly available). If there is a horizontal wet vent involved, then the lav can wet vent the bathtub, but the kitchen sink has to be kept separate and only come in after the bathtub.

- On the second floor, the vent shown above the writing "san-tee 45 on its side" is not needed, assuming that you use the lav to wet vent the toilet (2" drain/wet vent and dry vent from the lav san-tee). And if you aren't using the lav to wet vent the toilet, and intend that dry vent to be for the toilet, it would have to come off the toilet fixture drain before it combines with any other drain.

- In the fourth photo, it looks like you have a san-tee on its back for a drain connection. Under the UPC, the only use of a san-tee in drainage is with the straight path vertical, and the side path horizontal. If all three connections are dry vents, it can be used in any orientation. Also in that photo, you have a vent takeoff that appears to be rolled up less than the minimum allowed 45 degrees (and needs to be a wye or combo).

Cheers, Wayne

 

[Sponsor]

 

[MadScientist]

Thanks Wayne

It's a bit hard to follow your diagram and differentiate between vertical and horizontal. A few comments to start, not exhaustive:

I did n0t manage to draw it in 3d very well so i included the pictures. The pictures show the section of the drawing circled in red.
https://drive.google.com/file/d/1q8ra9kDwc-rlU51pmmkJCKdS7YX8UEPn/view?usp=sharing

- MN uses the UPC per up.codes. Under the UPC, a vent takeoff from a horizontal drain line has to be a wye or combo rolled up at least 45 degrees from horizontal, not a san-tee on its back.

I can change that to a wye.

- The kitchen sink drain needs to be 2" minimum (1-1/2" trap arm to a san-tee is OK). It appears you are vertically wet venting the 1st floor bathtub with the combined lav and kitchen sink. That's OK if there's no horizontal wet vent involved, but it means the vertical wet vent has to be upsized to 3" (well, 2-1/2", but that's not commonly available). If there is a horizontal wet vent involved, then the lav can wet vent the bathtub, but the kitchen sink has to be kept separate and only come in after the bathtub.

The main floor is existing i am going to remodel it when we can move into the new rooms upstairs. The tub has about 3 feet to tie into the take off. So i would need a 3" vent connected to the 2" drain for the lower level?

- On the second floor, the vent shown above the writing "san-tee 45 on its side" is not needed, assuming that you use the lav to wet vent the toilet (2" drain/wet vent and dry vent from the lav san-tee). And if you aren't using the lav to wet vent the toilet, and intend that dry vent to be for the toilet, it would have to come off the toilet fixture drain before it combines with any other drain.

- In the fourth photo, it looks like you have a san-tee on its back for a drain connection. Under the UPC, the only use of a san-tee in drainage is with the straight path vertical, and the side path horizontal. If all three connections are dry vents, it can be used in any orientation. Also in that photo, you have a vent takeoff that appears to be rolled up less than the minimum allowed 45 degrees (and needs to be a wye or combo).
Cheers, Wayne

In the drawing "the san-tee at a 45deg on its back" is the vent you are seeing in picture 4. The san-tee on its back is a wye with a 90deg street fitting for the tub.

Thanks
Jon