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Old 07-01-2010, 05:25 PM   #1
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bathroom sink drain line how small can I go?

Hi all, simple? question. New construction. Bathroom stated out as a washer / dryer room but we moved the machines upstairs with us and builder suggested the space could be used as a bathroom. They built the bathroom so small that people will hit the sink with their legs when they get up from the toilet. I need to recess the sink into a wall. What is a 2 x 6 wall I'm trying to make into a 2 x 1.5 wall across a couple of 16 O.C. studs so the sink can be recessed a couple inches. The PVC in the wall, at present, is 1 1/2 and I wonder is this Code? It is a 1/2 bathroom just the toilet and sink. Is there a 1 1/4 or some way to use something thinner? Not a big deal, just wondering. I can leave the area below the sink at the original 2 x 6 as constructed but the piping below the sink looks like it will be a headache if I do.




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Old 07-01-2010, 07:21 PM   #2
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To the best of my knowlege, 1 1/4 is allowed fot a bathroom sink. Others will likely weigh in.


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Old 07-01-2010, 07:49 PM   #3
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If you can find 1 1/4" you can use it for a lav
Always ask to see your contractors license!
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Old 07-02-2010, 09:52 AM   #4
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The drain from a bathroom sink is 1-1/4", but the piping inside the wall is 1-1/2" or larger. I don't know how you got the bathroom approved if you hit the sink when standing up from the toilet. Most Codes require 15" from center on both sides of the toilet, from any wall or cabinet (which would include a sink)..
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