Shower vent relocation

[djv]

I'm remodeling a bathroom and came across this vent pipe which I want to relocate into the wall. If I understand correctly, the existing horizontal section of the vent is already not code compliant (Horizontal vent section below the flood rim) and if I want to make the new route code compliant, it has to slope at least 45 degrees from the point it goes straight up. Am I misunderstanding the code? This is a dry vent.

Thanks, Damien.

 

[wwhitney]

That's my understanding of all the US codes, and I expect Canada's code is similar.

One slight weakening of the minimum 45 degrees above horizontal rule is that is not uncommon to see a wye used for the vent takeoff, with the wye rolled up 45 degrees from the side inlet being horizontal. That puts the side inlet vent takeoff at 30 degrees above horizontal; then a short segment at that slope, and a 60 degree bend to turn up into the wall. [Would not work in the picture in the OP, as the trap arm is connected to the side inlet.]

Cheers, Wayne

 

[Sponsor]

 

[Reach4]

If you can join the lavatory drain into the vent, then you can have a wet vent. Those can be horizontal.

The Ontario Building Code | Wet Venting

I don't know what offset, in 7.5.2.1.(i) means. 7.5.2.1.9(l) says "(l) the length of the wet vent is not limited."

 

[djv]

Thanks for the comments, appreciate it! Unfortunately no wet vent is possible. Lavatory is rouged in on the other side of the bathroom. I guess my only option is to re-route like this:

Remove the horizontal wye, put a new one for the vent, take the pipe through the TJI joist and take the vent above the shower flood rim and hide it in the pony wall.