Looking for advice on whether I need to add a vent to the waste line
downstream of the toilet (~3') where the new shower will tie in. A few
feet upstream from the toilet is the sink and the vent for the waste
line tees in there . I'm figuring I need to but I'm going to have to
move a heater and wreck some sheetrock on the other side of the wall if
I do. Any ideas?
Yes, you really should tie the
shower drain back to the vent stack,
downstream of the shower trap.
But...in this case, you might get
away with a mechanical vent or
Oatey makes one too.
If it matters, find out if the town will
accept a mechanical vent.
Horizontal wet venting (i.e., using the horizontal drain line as part of the
vent stack) is bad mojo. Usually against codes, too. You'll want to at least
route a vent from near your shower tie-in over to the vent stack by the sink (or
just go straight up through the roof...but that's typically a lot more work).
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