[gizzygone]

I'm weighing my pros/cons here; I have a future vent in my basement that I want to tie a new bathroom into. I can slope the vent the 35 feet towards one fixture, but in order to pick up other fixtures I'd have to tee in from above the main vent line.

I can't seem to find anything that says you're allowed to do this, but in order to preserve ceiling space it's the only way to do it.

I can rationalize the plan in my head; the slope is for any condensation to drain and maintain an open airway... So as long as the main span is sloping I won't jeopardize the vent. I just need to be sure the tie-ins also slope back to the fixture.

So knowing that I'd have to make some funky runs: would you resort to an AAV, or stick to a macgyvered vent plan?

 

[md2lgyk]

If properly done, I don't think there'd be anything wrong with tieing all the vents together. I did that when I built my house, so as to not have a bunch of vent pipes penetrating my roof (I have a log house with a 12/12 pitch metal roof, and did not want any vents visible from the front of the house). In fact, the only roof penetration is the main stack, which is located on the back side of the roof.

On the other hand, there's nothing wrong with using an AAV if they are legal where you live (or even if they're not, but I'll deny I ever said that). I have one for venting my kitchen sink, and it has never caused a problem.

 

[jeffnc]

I would definitely use an AAV if allowed by your code. Far easier.

 

[ben's plumbing]

you can't vent a bathroom group on an aav..:vs_no_no_no:

 

[md2lgyk]

you can't vent a bathroom group on an aav..:vs_no_no_no:

Good point. Not being a professional plumber, I never thought of that.

 

[gizzygone]

you can't vent a bathroom group on an aav..:vs_no_no_no:

Sounds like venting thru the roof is the only option, unless I can break up each fixture with their own AAV?

 

[jeffnc]

you can't vent a bathroom group on an aav.

Do you know the rationale for that?

 

[Ghostmaker]

Without knowing your state we do not know which plumbing code applies. Under IPC all that is required is all vents must be self draining. If the vent for your basement toilet will be longer then 40 foot to the roof it must be two inch.

 

[TheEplumber]

I'm weighing my pros/cons here; I have a future vent in my basement that I want to tie a new bathroom into. I can slope the vent the 35 feet towards one fixture, but in order to pick up other fixtures I'd have to tee in from above the main vent line.

I can't seem to find anything that says you're allowed to do this, but in order to preserve ceiling space it's the only way to do it.

I can rationalize the plan in my head; the slope is for any condensation to drain and maintain an open airway... So as long as the main span is sloping I won't jeopardize the vent. I just need to be sure the tie-ins also slope back to the fixture.

So knowing that I'd have to make some funky runs: would you resort to an AAV, or stick to a macgyvered vent plan?

I can't speak for the International code, but UPC allows dry vents to be flat(no slope). Do you know your code body?

The bold text is not clear- are you saying you want to drop a higher horizontal vent into a lower horizontal vent? If so, that can't be done.
Can you reroute/raise the existing?

 

[gizzygone]

I can't speak for the International code, but UPC allows dry vents to be flat(no slope). Do you know your code body?

The bold text is not clear- are you saying you want to drop a higher horizontal vent into a lower horizontal vent? If so, that can't be done.
Can you reroute/raise the existing?

We're in MA, which I think is UPC.

I think that's what I'm saying... Basically I can run a vent from the 2" future to the bathroom sink. But to pick up a the bar sink I'll need to run about 6" up from the vent, and then run to the bar sink.

I've stared at the basement ceiling for weeks.... I can't find a way to route it without doing it that way: there's a solid LDL that I have to clear above to get to the bar sink,and the bathroom has a shorter ceiling due to a first floor step down.

 

[Ghostmaker]

Thats E Plumbers code he will help you.

 

[TheEplumber]

Why don't you give us some pictures. I do better visually.
UPC is not very friendly towards AAVs. Your area may be more excepting though.

 

[gizzygone]

Why don't you give us some pictures. I do better visually.
UPC is not very friendly towards AAVs. Your area may be more excepting though.

I'll see if I can grab some/draw some tomorrow.

I'd like to avoid an AAV, because we'd need to apply for a "special permission" which I understand to be long and drawn out.

But aside from tearing down walls to run a new set if vents to the roof, I'm unsure of what I can do...