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Old 03-08-2014, 08:12 PM   #1
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Rough bathroom sink drain


Hi All,

I'll be tying into a 2" vent for my sink drain, but have a couple questions.

1.
How high up do I put the sanitary tee from the floor? I've seen anywhere from 18-20".

2.
Which method is preferred / best?

a. Use a 2" x 2" sanitary tee and then a 2" to 1.5 reducer on the stub out?
b. Use a 2" x 1.5" sanitary tee and then a 1.5 to 1.25 reducer on the stub out?

The attached picture is not mine, but my set up will be exactly the same.
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Rough bathroom sink drain-2249801244_e4a3c25e40.jpg  

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Old 03-08-2014, 08:54 PM   #2
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Rough bathroom sink drain


1) If there's going to be a vanity/cabinet base, then it's six of one and half dozen of the other. If it's a pedestal or console sink, then follow the rough-in specs that come with the sink.

When I was an apprentice, the master I worked for wanted them all at 18". I tend to put them in a little higher now because more and more cabinets seem to have a drawer on the bottom which pushes the "floor" inside the cabinet up a few more inches.

2) Use a 2" x 1-1/2" Tee off the vent. Stub out in 1-1/2"; your trap should also be 1-1/2". Use an 1-1/2" x 1-1/4" Trap Adaptor to connect the tailpiece to the trap.

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Old 03-08-2014, 09:12 PM   #3
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Rough bathroom sink drain


Pretty much the same for me.
20" above the floor works great on standard vanities. For 36" tops it'll take a tailpiece extension but that's no big deal
Waters I put 2" above the waste, @ 6" or 8" spread
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Old 03-09-2014, 09:42 AM   #4
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Rough bathroom sink drain


If that 2" vertical pipe you are tying into is truly a vent for fixtures on a lower floor, you should not be using it as a drain.
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