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Old 08-25-2009, 09:33 PM   #1
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Can a vent go higher than its starting point?


I am taping into a vent in my basement. The exposed pipe makes a 90 degree turn to the left. There is a plug at the bottom of that 90 degree turn. I was able to unscrew the plug. If I run the vent towards the new bathroom area the pipe will be low and in the way of the storage area behind the bathroom.

I want to tap into the vent and raise it higher so that I dont have the problem that I stated above in the storage area.

My idea was to tap in and put a pvc bushing. Instal a 90 degree elbow to the bushing. Start the run towards the right and immediately use a 45 going up until I can use another 45 at the hight that I want. Is that possible?

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Old 08-25-2009, 09:46 PM   #2
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Can a vent go higher than its starting point?


Can you post a pic?

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Old 08-25-2009, 09:53 PM   #3
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Can a vent go higher than its starting point?


A vent must rise from the fixture all the way out of the house or to where it ties into another vent. It cant rise, fall then rise again which if I'm reading your post correctly, you're wanting to do.
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Old 08-25-2009, 09:57 PM   #4
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Can a vent go higher than its starting point?


I was thinking he was using a cleanout to tie into then 45 up and after that little blurry

Any vent must rise a min of 6" above flood level rim before turnig horz
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Old 08-26-2009, 08:04 AM   #5
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Can a vent go higher than its starting point?


Here is an outline of what I want to do. The black line represents the current vent. The red is the new PVC that I want to run. The grey line represents the PVC vent at the current height. This height is a problem because where it enters the bathroom it will be in the way of a storage area that I plan to use regularly.

I am not connecting to a clean out. Thats a different project. lol

By the way, keep in mind that this is in the basement. The existing vent runs directly to the roof of the house.
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Old 08-26-2009, 08:09 AM   #6
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Can a vent go higher than its starting point?


no option to vent it separately?

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Old 08-26-2009, 08:35 AM   #7
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Can a vent go higher than its starting point?


No. Id have to run a new vent line to the roof. I asked about those independent vent devices but my town does not allow them.
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Old 08-26-2009, 09:21 AM   #8
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Can a vent go higher than its starting point?


You can't do that - water will collect at the low point, forming a "trap seal" and preventing the passage of air to vent fixtuers below.

Also, if that's a waste stack, solids will collect there as well.
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Old 08-26-2009, 10:32 AM   #9
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Can a vent go higher than its starting point?


Its a regular vent not a waste stack. What water would collect there? Would I be able to put a drain plug at the connection point or something similar?

Any other ideas on how to go about doing this? The default will be to run the grey line in the drawing.
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Old 08-26-2009, 09:12 PM   #10
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Can a vent go higher than its starting point?


No, you cant do that. A vent must rise from the fixture without sloping down then back up again. It must slope so that it slopes back to a drain. You'll collect water in that trap you made in your diagram from condensation and rain water. You might not collect alot of water all at once, but eventually you will choke off your vent. Since your doesnt allow air admittance valves I'm assuming you're having it inspected. An inspector wouldnt let that arrangement pass either.

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Old 08-27-2009, 06:49 AM   #11
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Can a vent go higher than its starting point?


So 6'4" it shall be. I wish I could use one of those air admittance valves but my town is a pain in the ass.

Thanks for all of the help everyone.

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