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Old 08-16-2012, 12:53 PM   #1
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Adding a Second Sink to Vanity


Hello,

I am currently renovating our master bathroom and have ordered larger vanity cabinets and am thinking of adding a second sink.

The vanity is 75" in length (30" vanity is 21" deep; 15" drawer bank that is 18" deep; then another 30" vanity).

Currently there is a 2" waste line that comes up under what would be the left sink and a 1.5" vent that I will tie back into that goes into the wall. Given the length of the vanity, the drains would be 45" apart and I would use the space behind the drawer bank to run the drain lines through.

Should I just come off the 2" line with a double santee and convert everything from that point to 1.5", with one drain running the longer distance to the right sink (~45") and the other being a short distance to catch the left sink? Then there would be 2 traps installed. I would then have the single vent off the double santee to reconnect with my 1.5" pipe that currently exists.

Thanks in advance,
Marty

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Old 08-16-2012, 01:37 PM   #2
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Adding a Second Sink to Vanity


that should work fine. that is the way i used to do the piping in the walls for a double vanity.

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Old 08-16-2012, 08:45 PM   #3
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Adding a Second Sink to Vanity


Thanks Danny. I wasn't sure if i needed to separate the drain/vent for each sink by using a couple Wye's.
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Old 08-16-2012, 11:39 PM   #4
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Adding a Second Sink to Vanity


Nope, one drain one vent.
Look under you kitchen sink of you have a double sink.
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Old 08-17-2012, 12:33 AM   #5
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Adding a Second Sink to Vanity


Quote:
Originally Posted by DannyT View Post
that should work fine. that is the way i used to do the piping in the walls for a double vanity.
Yep, nothing wrong with 2 lav traps sharing a vent
But instead of a double san tee- I use a fixture cross. It helps direct a drain snake downward rather then straight across the tee. Just a thought...
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