Stack Venting

pensfan84

pensfan84

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Quick question for everyone -

Am I able to stack vent a toilet and shower into a 4" ABS stack using a TY with a 2" inlet? Both the tub and the toilet are within 6' of the stack. Or should I branch drain the lav and tub and branch vent these above the highest fixture and tie into the vent stack? Thoughts?
 
You can never reduce the size of the drain...a toilet needs to be at least 3", so running it into a 2" pipe is an instant source of clogs.
 
jadnashua said:
You can never reduce the size of the drain...a toilet needs to be at least 3", so running it into a 2" pipe is an instant source of clogs.
Click to expand...

Sorry, I was not being clear. The stack is a 4" ABS. The TY would be 4", with a 2" inlet.

The stack will serve two bathrooms, and that's all. A total of five fixtures - one tub, two toilets, two lavatory.
 
vent

The proximity to a "stack" does not determine whether you need additional vents or not. WHAT the stack is being used for, and WHERE you make the connection, is what matters. Without seeing the job, we cannot tell you whether what you plan is doable or not.
 
hj said:
The proximity to a "stack" does not determine whether you need additional vents or not. WHAT the stack is being used for, and WHERE you make the connection, is what matters. Without seeing the job, we cannot tell you whether what you plan is doable or not.
Click to expand...

The stack is serving two bathrooms, and that's all. The connection would be made roughly 4' up the stack using a 4" TY with a 2" inlet. The connection is in the basement.

The 4" TY will service a closet bend going to a toilet and the 2" inlet will service a tub.
 
serving what ? as drain or vent or both" Are the bathrooms on the same floor or on different floors? It makes a difference
 
stack

That tells us NOTHING about where the various fixtures are located, but as soon as one other fixture flows past your connection, that stack is no longer a VENT for your new fixtures, and cannot be used as such, with a few exceptions.
 
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