Toilet venting question

[Nick_A]

Saw this image online and wondered if it meets code for venting. My initial concern would be that it has a horizontal leg, but that leg is not 6" higher than the flood rim of the toilet. Thoughts?

Thanks

 

[Terry]

That's an old method, not allowed now unless it's "washed"
Washed would be a wet vent from a lav. That way there would be a way to snake the line at a future date.

updated after reading Tuttles response.
It seems the old way is still doable.

 

[Sponsor]

 

[Nick_A]

Thank you for your reply - we will avoid this method. We have 15" of usable height available in the floor trusses. Would it be proper to kick the wye out to the side and run it up at an angle to a wall ~24" laterally away from the toilet? Basically, is there a gradient between fully vertical and fully horizontal that may be advised or is allowed?

Thanks again
Nick

 

[wwhitney]

Yes, the dividing line is 45 degrees off plumb, which is still considered vertical. But you wouldn't be able to transit 24" horizontally with only 15" of usable height at that angle.

Cheers, Wayne

 

[Tuttles Revenge]

Unless this question is posted in the wrong code group, the UPC allows for horizontal runs if structural conditions prevent the vent from rising vertically. The vent must be run with grade and using drainage fittings under the flood level. The invert/bottom of the vent must connect above the flood line of the horizontal drain its connected to.

905.3

https://up.codes/s/vent-pipe-grades-and-connections

 

[wwhitney]

Unless this question is posted in the wrong code group, the UPC allows for horizontal runs if structural conditions prevent the vent from rising vertically.

Yes, but that "if" is a judgement call. I would expect it to be applied as "if there's no reasonable routing that avoids the problem, then you can go horizontal" versus "you can just go horizontal whenever it would be inconvenient to route things closer to a wall."

Also, now that the UPC allows wet venting, are inspectors judging that the exception applies less often?

Cheers, Wayne

 

[Nick_A]

Thanks everyone for your help. Another question then, what are the implications of putting a vent pipe in an exterior wall? We could kick the wye the other way and wouldn't have to go laterally more than ~8 inches. But that would be taking a 2" vent up an exterior wall. It doesn't seem like there is a code against this, but logic says maybe we would worry about numerous other things, structural, insulation, condensation...?

Curious if this is advisable or what the issues with this type of setup would be from a plumbing standpoint.

Thanks
Nick

 

[Tuttles Revenge]

We install piping in exterior walls all the time.. But in temperate yet rainy Seattle. It would seem more of a building code issue with insulation etc.
\

 

[Terry]

True story
Preston, Washington, between Seattle and North Bend. My brother owned a home in Preston, and the pipes in the wall for the kitchen sink froze. There was no shutoff for the home, so we shut down the water supply for the town of Preston. No water meter either.

Repair done, and I put foam insulation around the pipes.
The next morning, the pipes had frozen again. This time no insulation on the pipes, and kept the wall insulation behind the pipes to act as a buffer, and nothing in front so as to allow the warmth of the home to reach the pipes. That worked.
It is also a plus if the cabinet doors are left open on those very cold nights.

And later that summer we went back, dug up the copper line to the home and soldered on a shutoff valve. We lifted it higher than the outside hosebib so that we could empty the line before soldering. See.........we only shut down the town of Preston three times.