Wall Hung Toilet Venting

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DIYdude

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I'm contemplating installing a wall hung toilet in my upstairs bathroom so I can raise the ceiling height in the downstairs bathroom about 7" to a more conventional 7'7". The upstairs toilet's drain is the main reason for the truncated height. If I decide to go forward, I'm unsure about venting. There's venting right off the top of the stack through the roof, so I was going to install a wye just before the wall hung toilet's drain pipe then reconnect up with the existing vent pipe above the carrier.

Thanks.
 

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hj

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quote; so I was going to install a wye just before the wall hung toilet's drain pipe then reconnect up with the existing vent pipe above the carrier.

And, what is the purpose for the "Y"? Is the upstairs wall "Thick", adn strong, enough to fit the carrier in ?
 

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quote; so I was going to install a wye just before the wall hung toilet's drain pipe then reconnect up with the existing vent pipe above the carrier.

And, what is the purpose for the "Y"? Is the upstairs wall "Thick", adn strong, enough to fit the carrier in ?
The Y would be installed to continue the main stack to the carrier and to vent through the roof. The wall is 2x6, and I planned on reinforcing it with additional framing for the new toilet.

I found this thread on the forum: https://terrylove.com/forums/index....et-need-advice-on-plumbing-and-venting.56159/
 
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hj

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From what the photo shows, the stack should go directly upward to the carrier and then through the roof, unless you are using some "mickey mouse" carrier that doesn't have the pipe as part of it.
 

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From what the photo shows, the stack should go directly upward to the carrier and then through the roof, unless you are using some "mickey mouse" carrier that doesn't have the pipe as part of it.
Unless I'm misunderstanding the configuration, won't the tank on the carrier get in the way of the vent?
 

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It depends on WHICH type of wall hung you have. Tank in the wall or on the toilet. I would prefer a tank on the bowl so I would have options down the road.
 

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It depends on WHICH type of wall hung you have. Tank in the wall or on the toilet. I would prefer a tank on the bowl so I would have options down the road.

Yeah, my wife doesn't like the look of the toilets with the tank on the bowl that we've seen so far. Is there a sleek-looking wall hung toilet that has an exposed tank? Most I've seen look rather bulky.
 
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I talked to a city inspector, and it looks like my best bet is to install a sanitary tee then connect up with the existing vent above the carrier with in-wall tank. Also, I was told that it's not necessary to beef up the framing, since the carrier should support the bowl.
 
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I finally got around to getting this toilet installed (Kohler K6284 carrier and K6299 toilet). The positioning of the drain per the installation instructions will require it to be slightly offset from the main stack, so I glued up a couple 22.5° elbows (of course, with ABS pipe between them) to try to match the offset. The one problem I'm having is that I have to increase the pipe size from 3" to 4", and this is causing the top of the stack to tilt a little forward at the top; the 4" pipe is no longer level at the top, if this makes sense. I'm using a miter saw to make my cuts so they're straight. I've attached pics of the crazy stack I've mocked up. Is there anything you'd do differently?
 

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DIYdude

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I finally got around to getting this toilet installed (Kohler K6284 carrier and K6299 toilet). The positioning of the drain per the installation instructions will require it to be slightly offset from the main stack, so I glued up a couple 22.5° elbows (of course, with ABS pipe between them) to try to match the offset. The one problem I'm having is that I have to increase the pipe size from 3" to 4", and this is causing the top of the stack to tilt a little forward at the top; the 4" pipe is no longer level at the top, if this makes sense. I'm using a miter saw to make my cuts so they're straight. I've attached pics of the crazy stack I've mocked up. Is there anything you'd do differently?
 

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DIYdude

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OK, I was able to finagle the stack enough to get the carrier outlet pipe to fit inside the 4" drain pipe. The toilet seems to work great. I'll post pics of the whole installation after I get my bearings - sleep has been minimal with this installation, since it's in the only working bathroom in the house :(. I'd like to get feedback on my work from pros. This has been a long and trying installation process, but the 7" in height I gained in the downstairs bathroom was worth the effort.
 

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Here are some pics.
 

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DIYdude

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Pic of temporary toilet installation until the bathroom is remodeled.
 

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