Single Vanity to Double Venting

[Jack Crownover]

I am installing a double vanity in place of my single. I have attached an actual photo as well as the design intent sketch above. The drain goes to the 2nd floor bath and I assume is vented however would you add a studor mini vent? Where would that need to be located? I was thinking between the two sinks but wanted advise.

 

[Helper Dave]

You're sure that sink is just tied into a drain? It's not vented if that's the case. Either the blue pipe is its vent, or there's a vent coming off before the drain. That assumes it was done correctly, of course.

If it IS vented, you can just run over, and add the 2nd sink. Sinks can share a common vent as long as nothing else is tied on there already.

 

[Sponsor]

 

[wwhitney]

IPC or UPC? I believe it varies in Texas, and affects the answer.

Cheers, Wayne

 

[Jack Crownover]

You're sure that sink is just tied into a drain? It's not vented if that's the case. Either the blue pipe is its vent, or there's a vent coming off before the drain. That assumes it was done correctly, of course.

If it IS vented, you can just run over, and add the 2nd sink. Sinks can share a common vent as long as nothing else is tied on there already.

Thank you. It appears it is just the drain. Would you recommend an air admittance valve and where should that be placed/

 

[Jack Crownover]

IPC or UPC? I believe it varies in Texas, and affects the answer.

Cheers, Wayne

Thank you for the reply. IPC is what I need to follow.

 

[wwhitney]

Then you can use an AAV between the first trap and where the second lav joins in. It could be in the first lav cabinet on the trap arm, they make tubular adapters for that. The first lav can wet vent the second lav.

Cheers, Wayne

 

[Jack Crownover]

Then you can use an AAV between the first trap and where the second lav joins in. It could be in the first lav cabinet on the trap arm, they make tubular adapters for that. The first lav can wet vent the second lav.

Cheers, Wayne

thank you!