Bathroom group

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Oscarmeyer28

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Can you use a 2" vent for a bathroom group ? Toilet,shower, sink. Looking to wet vent it. Tub ties into 3" trunk, sink ties into 3" trunk, shower ties into 3" trunk then a 2" vent on the 3" trunk.
 

Jeff H Young

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as long as they are "wet" . Unsure without drawing about the shower wet vent sounds iffy if its plumbed right yes
 

wwhitney

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Can you use a 2" vent for a bathroom group ?
Under the IPC, you could use a 1.5" vent.

Toilet,shower, sink. Looking to wet vent it. Tub ties into 3" trunk, sink ties into 3" trunk, shower ties into 3" trunk then a 2" vent on the 3" trunk.
But generally not like that. Each trap (sink, tub, shower) needs a vent connection on the trap arm before the trap arm falls more than one pipe inside diameter. The sink trap is highest, so it gets a 1.5" (minimum) dry vent connection. Then the sink drain turns down into the floor system and turns horizontal. The tub or shower joins it horizontally, and the combined drain needs to be 2". Then the shower or tub (respectively) joins it, and then the combined drain needs to be 3" if it is to wet vent a WC.

Cheers, Wayne
 
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Oscarmeyer28

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Under the IPC, you could use a 1.5" vent.


But generally not like that. Each trap (sink, tub, shower) needs a vent connection on the trap arm before the trap falls more than one pipe inside diameter. The sink trap is highest, so it gets a 1.5" (minimum) dry vent connection. Then the sink drain turns down into the floor system and turns horizontal. The tub or shower joins it horizontally, and the combined drain needs to be 2". Then the shower or tub (respectively) joins it, and then the combined drain needs to be 3" if it is to wet vent a WC.

Cheers, Wayne

It would look like this the sink would have a trap then use a sweep 90 to go down then a sweep 90 to the 3" trunk. I could probably put a 1 1/2" vent for the sink if I have too. My basement walls are icf so I can cut the styrofoam if I have to but I'd like to not....
 

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Jeff H Young

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It would look like this the sink would have a trap then use a sweep 90 to go down then a sweep 90 to the 3" trunk. I could probably put a 1 1/2" vent for the sink if I have too. My basement walls are icf so I can cut the styrofoam if I have to but I'd like to not....
still not clear the shower venting . 2 inch vents are no problem though
 

Oscarmeyer28

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still not clear the shower venting . 2 inch vents are no problem though

Maybe I'm not understanding it? With wet venting you can use 1 vent for the group I believe.... So the shower is vented through the same 2" vent as the toilet is vented as well as the sink. So one 2" vent for the whole bathroom. Something like the picture
 

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Jeff H Young

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ok yea it should be fine , something in description was confusing me but no problem the whole bathroom on one vent
 

wwhitney

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It would look like this the sink would have a trap then use a sweep 90 to go down then a sweep 90 to the 3" trunk.
So that's not allowed, you need to vent the sink trap arm before the 90. [Which, BTW, for horizontal to vertical can be a quarter bend, it doesn't need to be long turn 90.] But as you are under the IPC, you can use an AAV at the sink (even on the trap arm within the sink cabinet, there are products made for that).

Then the rest of your diagram works. Assuming that's an ejector pit at the end of your drawing, keep the 2" vent through the roof rather than relying on the AAV to vent the whole bathroom group. The ejector pit will require a vent through the roof anyway, but the two vents can combine at a level above the highest point that the pit pumps to (or 6" above the sink flood rim, if that's a higher elevation).

Cheers, Wayne
 

Oscarmeyer28

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So that's not allowed, you need to vent the sink trap arm before the 90. [Which, BTW, for horizontal to vertical can be a quarter bend, it doesn't need to be long turn 90.] But as you are under the IPC, you can use an AAV at the sink (even on the trap arm within the sink cabinet, there are products made for that).

Then the rest of your diagram works. Assuming that's an ejector pit at the end of your drawing, keep the 2" vent through the roof rather than relying on the AAV to vent the whole bathroom group. The ejector pit will require a vent through the roof anyway, but the two vents can combine at a level above the highest point that the pit pumps to (or 6" above the sink flood rim, if that's a higher elevation).

Cheers, Wayne
So if I went sink trap to a 45 then another 45 I could vent it this way since it wouldn't be a vertical to horizontal? I'm willing to use the AAV if for some reason going through the styrofoam is an issue.
 

wwhitney

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Let me draw your attention to the earlier statement I made that answers your question:

"Each trap (sink, tub, shower) needs a vent connection on the trap arm before the trap arm falls more than one pipe inside diameter."

So, no using two 45s instead of a 90 doesn't help. You have to connect to a vent (dry, wet, AAV, whatever) before the trap arm turns down.

As to an AAV or putting a regular vent in your ICF, either one works.

Cheers,
Wayne
 

Oscarmeyer28

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Let me draw your attention to the earlier statement I made that answers your question:

"Each trap (sink, tub, shower) needs a vent connection on the trap arm before the trap arm falls more than one pipe inside diameter."

So, no using two 45s instead of a 90 doesn't help. You have to connect to a vent (dry, wet, AAV, whatever) before the trap arm turns down.

As to an AAV or putting a regular vent in your ICF, either one works.

Cheers,
Wayne
I see ok great thanks for the help!
 
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