Plumbing vent revisited

[capitandiablo76]

This is a continuation of a previous thread. I am currently in a heated debate with my plumber about the proper venting of my toilet. This is a bathroom in a pole barn. Plumbing has been roughed in prior to concrete which is being poured later this week. Below are a few pictures. One is of how the plumbing is currently ran and the other is how I think it should be ran. Plumber states that the way the pipes currently are ran the toilet will vent from either of the sink lines once they are vented. I believe there needs to be a wye added to the 3" line right before the toilet but before where the shower line tee's in to act as a vent for the toilet. Who is right? I am withholding payment until I know this is done correctly.

 

[Jackfre]

You are correct. He is calling for a “wet vent” and in this case using it on a WC is the ultimate in the ‘hit & hope” dept, plumbing wise. Push him and ask him to show you where in the Uniform Plumbing Code it is allowed. Get on your GC’s *** now.

 

[kinglake]

Using a wet vent for a toilet, and in fact the entire bathroom, is perfectly up to code if done right. Its impossible to see what fittings were used though but if they are wye's and not tees and are not angled vertically at all, it would be correct.

 

[Zeke]

I'm going to contradict myself and say if both sinks are vented, even if tied together, it will work. One vent must provide a clear path to the main line with no 90's. It looks like only the WC is a wet vent if the sinks are vented to the outside.

I think the problem is not so much under the slab but what is going to be done about the venting above the traps.

When the shop sink is roughed in I think a clean out on the other side of the wall would be wise.

 

[capitandiablo76]

Using a wet vent for a toilet, and in fact the entire bathroom, is perfectly up to code if done right. Its impossible to see what fittings were used though but if they are wye's and not tees and are not angled vertically at all, it would be correct.

Here is a better picture of the fittings…

 

[kinglake]

Here is a better picture of the fittings…

As Zeke stated, we are making an assumption there will be vertical vent stacks for both sinks. If so, there should be zero issues.

 

[kinglake]

BTW, it's your shop. If you want a wye and separate vent for the toilet, the plumber should do it. It very well might cost you a bit more for the 30 minutes and additional wye, but if will make you sleep better at night, now is certainly the time to do it.

 

[duneslider]

I'm no plumber but I have one bathroom in the same situation as what you are showing and my plumber added a wye for a vent and there is a sink with vent in a closer proximity than what yours will have. I've never heard of problems with too much venting...

 

[PCustoms]

I thought we already discussed the wet vent from the sink concept in your original thread, why did a new one need to be made?