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Old 12-14-2019, 10:08 AM   #1
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Ok to re-route vent with PVC to fit medicine cabinet?


Hi, I just cut the drywall to fit a 50"wide x 26" tall medicine cabinet. When I made a hole to pull the drywall I found a vent pipe right in the middle of it. Is it ok to cut it and re-route it to the left around the cabinet hole with PCV pipe? If not, can you think of any other solution? It is a small bathroom so surface mount is not an option...it would stick out 5" and the side would face the entrance to the bathroom. Looks like the diameter of the copper pipe is 2" by the way. Thank you for your help in advance.
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Old 12-14-2019, 10:14 AM   #2
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Re: Ok to re-route vent with PVC to fit medicine cabinet?


LOL, modify the medicine cabinet so the vent passes right through it.

Maybe,
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Old 12-14-2019, 10:16 AM   #3
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Re: Ok to re-route vent with PVC to fit medicine cabinet?


You can move it, but if you are going a stud bay over, that it too big to just cut through the stud.
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Old 12-14-2019, 10:23 AM   #4
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Re: Ok to re-route vent with PVC to fit medicine cabinet?


How many studs are you going to cut, are you sure it is not a load bearing wall?
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Old 12-14-2019, 10:24 AM   #5
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Re: Ok to re-route vent with PVC to fit medicine cabinet?


Ok, I'll move it to the left....I'll just cut at the bottom and top of the copper pipe, and make a "U" to the left using PVC pipe and elbows. There is a stud to the left that I need to remove anyway to be able to install the cabinet. Thank you for the quick help!

Nealtw, I have to cut 3 studs. The wall runs parallel to the joists so my understanding is that they are NOT load bearing. Any other way to know? There is nothing above the bathroom except the flat roof.

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Old 12-14-2019, 10:30 AM   #6
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Re: Ok to re-route vent with PVC to fit medicine cabinet?


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Originally Posted by nelaco View Post
Ok, I'll move it to the left....I'll just cut at the bottom and top of the copper pipe, and make a "U" to the left using PVC pipe and elbows. There is a stud to the left that I need to remove anyway to be able to install the cabinet. Thank you for the quick help!

Nealtw, I have to cut 3 studs. They run parallel to the joists so my understanding is that they are NOT load bearing. Any other way to know? There is nothing above the bathroom except the flat roof.
That should be fine but you should remove an extra three inches in height so you can put a 2x4 across the top and bottom, you don't want 4 ft of unsupported studs.
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Old 12-14-2019, 10:43 AM   #7
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Re: Ok to re-route vent with PVC to fit medicine cabinet?


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That should be fine but you should remove an extra three inches in height so you can put a 2x4 across the top and bottom, you don't want 4 ft of unsupported studs.

Ok, I'll do that and build a box all around it then. Thank you for the quick help!
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Old 12-14-2019, 11:00 AM   #8
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Re: Ok to re-route vent with PVC to fit medicine cabinet?


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Ok, I'll do that and build a box all around it then. Thank you for the quick help!
Your top and bottom plates should reach the full studs on the sides



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Old 12-14-2019, 11:05 AM   #9
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Re: Ok to re-route vent with PVC to fit medicine cabinet?


[QUOTE=Nealtw;6006743]Your top and bottom plates should reach the full studs on the sides


Ok, thank you for clarifying and the video.
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Old 12-15-2019, 10:10 AM   #10
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Re: Ok to re-route vent with PVC to fit medicine cabinet?


When rerouting the vent, make sure that you maintain a decent slope on the horizontal parts, although with your case it won't be far.

PS. That's plumbing not HVAC.

Cheers!
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Old 12-15-2019, 11:52 AM   #11
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Re: Ok to re-route vent with PVC to fit medicine cabinet?


Since this is a plumbing question and I'm just an hvac guy, I have a question.

How would he go from copper to pvc? Do they make rubber couplings with hose clamps that are made for and acceptable for this purpose?
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Old 12-15-2019, 12:18 PM   #12
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Re: Ok to re-route vent with PVC to fit medicine cabinet?


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Since this is a plumbing question and I'm just an hvac guy, I have a question.

How would he go from copper to pvc? Do they make rubber couplings with hose clamps that are made for and acceptable for this purpose?
Yes Fernco couplings.

https://www.thepondoutlet.com/fernco-couplings
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Old 12-15-2019, 03:34 PM   #13
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Re: Ok to re-route vent with PVC to fit medicine cabinet?


Copper venting is something I haven't seen much of. I don't blame the OP for wanting to adapt it to ABS for his project. Sweating that size copper will take more than the average homeowner will be able to do with a Bernzomatic torch, even if using a turbo tip torch and Mapp gas.

I'd use long radius 90 ells just in case some sad day I'd need to run a drain snake down that vent. Probably overkill but that's how I roll. YMMV
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