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Old 06-15-2016, 02:09 PM   #1
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Bath room vent


Hi all, I just put a new roof on my house. Had a couple of roof leaks. So today I went about replacing some water damaged drywall. When I opened up the wall. What I found was a vent pipe to the bathroom enclosed in the wall. Does not seem to be any mold or anything. But I know gas etc. can be dispersed into the wall cavity. Can I just extend this 2 inch pvc pipe up into the attic? Or does it have to go through the roof. I really don't want to be cutting holes in my new roof. I also can not afford to hire a plumber and a roofer at this time due to money constraints. Dang new roof had to have a lot more decking replaced which just about taped me out. As it is I am at a stand still till I get this figured out. Thank You for any and all suggestions, Charlie.
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Old 06-15-2016, 04:13 PM   #2
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Re: Bath room vent


Runs through the roof and in some places must be 3 inch out the roof.
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Old 06-16-2016, 10:21 AM   #3
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Re: Bath room vent


while I am not a big fan of them, you can opt with an AAV box with a access grill panel, Best through the roof but if not use the AAV. can not be mounted in attic or plume.
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Old 06-16-2016, 01:57 PM   #4
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Re: Bath room vent


Okay I think I got this figured out. Although I did find another stack vented up into the attic. So while I am up there i will put it through the roof too. I do have a question though. When I cut the hole in the roof. Can I use PVC pipe to vent outside? Also do I leave the pipe straight up or do I put an elbow on it? Seems easy enough.
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Old 06-16-2016, 08:51 PM   #5
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Re: Bath room vent


Straight up make sure about the roof penetration pipe size. Colder areas have larger pipe requirements. Ohio is 3 inch 12 inches below roof and 12 inches above as a minimal distance.
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Old 06-17-2016, 06:30 AM   #6
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Re: Bath room vent


Okay I see here in Illinois I need 3 inch pipe through the roof. Last question. How far from the eve of the roof must this be placed? Thank you all for the responses. Charlie.
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Old 06-17-2016, 06:36 AM   #7
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Re: Bath room vent


I have a similar issue and a question. If i have a 4 inch stack already exiting through the roof, can I cut into that stack, install a wye, and tie my new vent into that wye? This would obviously avoid the risk of cutting and sealing a new hole in the roof.

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Old 06-17-2016, 08:54 AM   #8
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You cannot run a bathroom vent fan into a plumbing stack. Putting a hole through a shingled roof with a proper hood and flange is not difficult and is leak proof .
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Old 06-17-2016, 01:25 PM   #9
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Re: Bath room vent


In my case this is not a bath room fan vent. I believe it is the vent stack off of a bathtub. Can I just 45 over to the vent stack that goes through the roof? The thing is if I just go straight up I will only be about a foot and a half away from the eve the house.
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Old 06-17-2016, 04:04 PM   #10
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Re: Bath room vent


YEs you can. as long as we aint talking about a fart fan.
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Old 06-18-2016, 06:05 AM   #11
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Re: Bath room vent


Thank you!
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