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I am doing a bathroom reno and have three questions about venting and drains.

#1 - There was vent left open in the wall. It is on the left facing down. Is it appropriate to just cap that and leave it be?

open vent

#2 - I can’t move the sink drain back into the wall. Would it be OK to run a 45 from the floor towards the wall and then connect to a 45 in the wall for the drain? The trap arm would run straight back and connect into the vent with a sanitary tee.

correcting drain and vent

#3 - I vent will be added from the floor below sink. Is it correct to just connect into the vertical stack at least 6” above the sink level with another sanitary tee?

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  • Does "floor below sink" mean " a sink on the lower level"?
    – isherwood
    Commented Jul 11 at 18:09
  • The vent in #1 appears to have been for something in the lower level, judging by the hole in the wall plate. can't you tie into that for your new vent?
    – isherwood
    Commented Jul 11 at 18:11
  • Yes, there is a powder room almost below and the sink currently uses an air admittance valve. Since the walls are open I rather connect into the demoed bathroom vent for a more permanent solution. I was hopeful to just tie it into the old vent. Unfortunately I can’t connect into it without cutting open drywall below. I rather tie it into the sink because it is the utility closet below and less repair work for the same result.
    – junta
    Commented Jul 12 at 1:55

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#1:

"Is it appropriate to just cap that and leave it be?"

You should get rid of it and plug the tee where it originates from.

#2:

"Would it be OK to run a 45 from the floor towards the wall and then connect to a 45 in the wall for the drain?"

YES

#3:

"Is it correct to just connect into the vertical stack at least 6” above the sink level with another sanitary tee?"

YES, but the sani-tee should be installed upside-down, if this is a dedicated vent.

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  • One more question. The vent will ideally will come up next to the left stud on the wall with the flue. I believe it is a class B because it is doubled wall. My understanding is the vent pipe can be within 1” of the flue due to being a class B. There is only 5” of clearance between the stud and the flue. Is this correct?
    – junta
    Commented Jul 15 at 18:30

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