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Old 01-03-2015, 08:02 PM   #1
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Master bath re-model


Hello , I am looking for some help with confusion on plumbing drains and slope. I am relocating an old single sink vanity from one wall and making it a two sink vanity on a wall 90 Degree from old . Total length of drain line would be approx. 6 feet on new wall, make a 90 degree turn and run about 6-8 feet to the existing waste pipe. Do you still maintain 1/4" slope from beginning to end. And if so , wouldn't this put the p trap outlet more than the 1 1/2" pipe diameter below the waste input? Any suggestions?
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Old 01-03-2015, 08:38 PM   #2
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Yes, it would. You will need to revent the waste line serving the sink. The revent can connect to your vent stack- usually at 42" above the floor
Also, the 90* turn at the corner will need to be a long sweep 90 or 2- 45's joined together to make a 90
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Old 01-03-2015, 08:48 PM   #3
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."You will need to revent the waste line serving the sink. The revent can connect to your vent stack- usually at 42" above the floor""
I don't exactly know what you mean by reventing at 42".. I am working on getting some photos uploaded and may help clarifying it.
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Old 01-03-2015, 10:55 PM   #4
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what he means is after you run your new drain you would also have to bring a vent from new drain starting at least 42" off floor back to existing vent...
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Old 01-04-2015, 12:05 AM   #5
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Heres a quick sketch- this is just one possible route for the vent.
BTW, you must be 1/4" per ft on the drain line
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Old 01-04-2015, 10:57 AM   #6
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For every foot of line you run you'll need to drop 1/4 inch per foot from the trap ware to the vertical drop i only mention this because if you have a low sink combo you'll have a problem with your drain/trap/pop up assembly, a common mistake most make on a relocation seen lots of plumbers make these mistake homeowners are forgiven not professional plumbers shame on them.

now depending on the size of your line and your code you'll to re vent every x amount of feet from the trap and the vent must be above the rim line / flood line of the servicing sink
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