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Old 01-08-2010, 02:48 PM   #1
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Basement bathroom sink drain line on a slight upwards slope an issue?


Hi,

My basement is in the process of being finished by a hired contractor/company and I'm looking at the drain pipe for the sink and wondering if I should be worried. He tied the sink drain to the rough-in in the basement but it's on a very slight upwards slope. I tried taking a picture to show it... hopefully it's good enough.



Last edited by dtran; 01-08-2010 at 02:52 PM.
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Old 01-08-2010, 07:59 PM   #2
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Basement bathroom sink drain line on a slight upwards slope an issue?


The sink will probably work fine forever, but that is definitely an example of poor craftsmanship. I would demand that it be corrected. The horizontal pipe should of had a hanger on it.

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Old 01-08-2010, 08:17 PM   #3
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Basement bathroom sink drain line on a slight upwards slope an issue?


In the plumbing code Draniage piping 2.5" pipe and smaller should have a slope of .25" per foot.
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Old 01-08-2010, 08:20 PM   #4
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Basement bathroom sink drain line on a slight upwards slope an issue?


this type of piping should have at least 1 strap to support it as noted.
It requires support every 4' at least and there are none I can see.
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Old 01-08-2010, 08:53 PM   #5
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Basement bathroom sink drain line on a slight upwards slope an issue?


Water will persist (or collect) in the section of pipe before the upslope in the same manner as water remains in a trap. The won't be any problem as long as hair or soap residues etc. have not also collected there. A potful of boiling water every so often may help keep it clear.
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Old 01-08-2010, 08:57 PM   #6
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Basement bathroom sink drain line on a slight upwards slope an issue?


Thanks guys. That's pretty much what I thought.

BTW, FWIW, maybe it looks longer in the image, but that horizontal piping is only just under 3'.

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Old 01-08-2010, 09:20 PM   #7
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Basement bathroom sink drain line on a slight upwards slope an issue?


I know a level isn't the best way to check, but I just put one on the pipe and it's actually level. My housemate is nitpicky and has bugged the contractor several times (for other unrelated small imperfections), so I'll just go out and buy a strap to lift the one side a little giving it a slight slope downwards.

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Old 01-10-2010, 05:05 PM   #8
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Basement bathroom sink drain line on a slight upwards slope an issue?


tell him to cut the santee out of the stack and install new one lower down to achieve fall in pipe

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