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Old 09-19-2011, 09:54 AM   #1
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vent pipe installation


I'm planning to redo the bathroom. The toilet will be relocated and it'll back against an exterior wall. Is it okay to run the vent pipe on the exterior, meaning it'll run vertically along the side of the exterior other than the minor negative aesthetic effect. It'll be similar to what's in the attached picture, except the vent pipe runs on the exterior.

I live in SoCal. thanks.
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Old 09-19-2011, 10:20 PM   #2
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I don't see any reason why not, aside from not knowing what your local code is.

I've seen it here, and it doesn't look very nice. Of course you still have to have a roof penetration, so the downfall is now you have a roof penetration and a wall penetration, but if you're ok with that and local code allows it, I don't see why not.


What's stopping you from running the vent conventionally?

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Old 09-19-2011, 10:30 PM   #3
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Can't you just move the drain pipe and leave the existing vent where it is? Not sure what your drawing is, a toilet with a vent coming off the tank?
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Old 09-19-2011, 10:41 PM   #4
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Not sure what your drawing is, a toilet with a vent coming off the tank?
I lol'ed. Noticed that myself, but figured maybe it was the closest he could find to what he was trying to accomplish.

It would be nice to have some kind of floor plan at least if not an isometric of the plumbing plan, maybe you could get some suggestions that you like that will work better than running a vent on the outside of your house.
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Old 09-20-2011, 12:31 PM   #5
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if I instead run the toilet vent pipe inside the wall (which is the exterior/load bearing wall) , is it okay to drill a 2" knock out in my 2x4 top plate ?
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Old 09-20-2011, 11:20 PM   #6
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Yes, but are you sure you have to move the vent? There's one there already, right?
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Old 09-21-2011, 08:59 AM   #7
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here's what I'd like to do(see drawing). the new toilet will be turned around and facing where it used to be.
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Old 09-21-2011, 09:02 AM   #8
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What's the total distance in movement of the flange?

You're allowed to be 6 feet (Oregon code) from the vent to the flange.
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Old 09-21-2011, 10:36 AM   #9
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What's the total distance in movement of the flange?

You're allowed to be 6 feet (Oregon code) from the vent to the flange.
from flange to vent: maybe 15 inches if going thru the exterior wall, add another 6 or 8 inches if going outside of the exterior wall.
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Old 09-21-2011, 09:14 PM   #10
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I'm talking about the old location to the new location.
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Old 09-21-2011, 09:56 PM   #11
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I'm talking about the old location to the new location.
about 3 ft
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Old 09-21-2011, 11:21 PM   #12
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about 3 ft
Is it directly in front of the old location? Straight shot?
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Old 09-21-2011, 11:23 PM   #13
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Is it directly in front of the old location? Straight shot?
yes. but the old pipe is cast iron which I'd like to get away from.
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Old 09-22-2011, 09:15 AM   #14
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yes. but the old pipe is cast iron which I'd like to get away from.
Well that's your prerogative then, but there are lots of cast iron installations out there that are working just fine. Most of the problems I find with cast iron drainage systems are their galvanized counterparts that are attached to them. If the cast iron is still in good shape, you'd save yourself a lot of work just tying into it where you cut the old bend off.

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