Re: Venting lavatory sinks
Posted by CEA on March 23, 2004 at 12:58:08:
In response to Re: Venting lavatory sinks
Generally speaking: You can tie drains together downstream of their vent connections, but not upstream. You can tie vents together as long as any connections or horizontal offsets are made 6" above the flood rim of the highest fixture.

As long as you follow these rules you can probably avoid making matters worse, but as Deb described you would need to upgrade the shower trap and drain to 2" and install separate vents for the tub and shower within the "critical distance" (which varies by code) of the traps in order to bring the entire installation up to code.

This stuff isn't as easy as it looks.

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