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Old 04-25-2010, 04:47 PM   #1
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Relocating exsistent vent pipe


I am adding a window in my kitchen and came across a vent pipe that is running verticle with the wall studs and will be in the way. Can I 90 the pipe to run horizontal above the window header and go through 2 cieling joists then 90 the pipe to run verticle and then add another 90 to run horizontal again under the window and tie it back into the original verticle section? What are the considerations I need to take? Are their building codes that do not allow this? Any inof would be great. Thanks in advance.

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Old 04-25-2010, 04:54 PM   #2
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Relocating exsistent vent pipe


You would be doing a plumbing job, which in my state (MA) can only be legally done by a plumber. I don't know about your state rules. If the rules in your state prohibit doing your own plumbing, and you still want to do it without a permit, I recommend purchasing a book on plumbing, and getting a copy of your local plumbing code. Asking the building inspector for help would be a problem if you are not permitted to do your own plumbing, as it obviously would trigger a red flag.

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Old 04-25-2010, 11:54 PM   #3
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Relocating exsistent vent pipe


Oregon plumbing code reads as follows.

Each vent must rise vertically to a point no less than 6" above the flood level rim of the fixture being served before offsetting horizontally . . .


The kicker is that you get an exception if your window sits too low for this. You are allowed to be less than 6" if you go as HIGH AS POSSIBLE, run the vent on grade 1/4" per foot, and use drainage fittings instead of vent fittings.
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Old 04-26-2010, 12:02 AM   #4
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Relocating exsistent vent pipe


Thanks for the info just out of curiosity why drainage fittings and not vent.
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Old 04-26-2010, 09:59 AM   #5
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Relocating exsistent vent pipe


Because if you're below the sink, the drain could possibly back up into the vent.
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