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Old 04-11-2014, 08:09 PM   #1
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Toilet Flange Dilemma


Hey all,

I have a dilemma with installing a toilet flange in a basement bathroom I'm adding. The neck of the toilet flange is 2-1/8" long. But I will only have about 1-1/2 inches to slide it on to the 3" pipe. The pipe is embedded in concrete except for the 1" of SLC I poured around it where I gave it plenty of room for the flange. And once I add tile, I'll gain an additional 1/2". So that's a total of 1-1/2" for the flange. Can I cut the flange neck down to 1-1/2"? Or do I risk breaking the pipe by chiseling out concrete (this scares me)? Do they sell shorter neck flanges? Any advice appreciated.

Also, I'm guessing I should avoid a flange that goes on the inside since it's a 3" pipe.

Thanks,
Jon


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Last edited by jonhayden; 04-11-2014 at 08:12 PM.
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Old 04-11-2014, 10:36 PM   #2
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Toilet Flange Dilemma


I've done the flange that goes on the inside and it wasn't a problem.

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Old 04-11-2014, 10:54 PM   #3
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Toilet Flange Dilemma


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Originally Posted by cleveman View Post
I've done the flange that goes on the inside and it wasn't a problem.
And you did that on a 3" pipe? I think that's what I might have to do, but I don't want to deal with continuous clogs.
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Old 04-11-2014, 11:13 PM   #4
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Toilet Flange Dilemma


That's a tough call. If you chisel it will probably scratch or gouge the pipe and that won't be good. If you have a hammer drill you could cut the flange and put tap cons in the flange which should work. If you have a chipping gun or hammer drill with a chipping bit. I don't know. Your call. Wish I could of been more of a help.
edit-There might be insulation around the pipe where it comes through the slab under a thin layer of the old concrete if the house isn't that old. Just a thought.

Last edited by Robpo; 04-11-2014 at 11:22 PM.
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Old 04-11-2014, 11:22 PM   #5
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Toilet Flange Dilemma


Chisle the concrete it is no big deal
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Old 04-11-2014, 11:30 PM   #6
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Toilet Flange Dilemma


Plumbers chisel all the time. Or cut the hub down to 1.5"
Dont glue inside a 3" pipe though
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Old 04-12-2014, 12:19 AM   #7
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Toilet Flange Dilemma


This makes sense , my tenants are always calling me a chiseler.
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Old 04-12-2014, 07:05 AM   #8
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Toilet Flange Dilemma


I believe I went on the inside of a 3" pipe, if such a flange is available. It was something I left stubbed up and came back a number of years later and installed a toilet.

I don't know of any troubles with the installation. The 3" pipe probably drops right into a 4" because it is near where the sewer leaves the house and I had a length of 4" pipe there with a lot of stuff emptying into it.
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Old 04-12-2014, 08:11 AM   #9
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Toilet Flange Dilemma


On a 3" pipe--always use an out side flange---the inside flanges have a small opening--often the toilet outlet horn will hit the flange --and not allow the toilet to seat---get out your chisel---
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Old 04-12-2014, 12:19 PM   #10
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Toilet Flange Dilemma


Quote:
Originally Posted by Robpo View Post
edit-There might be insulation around the pipe where it comes through the slab under a thin layer of the old concrete if the house isn't that old. Just a thought.
Yeah, this was my fault I actually moved the rough-in and poured new concrete. I did wrap the pipe in sill seal, but I miscalculated how low to go on the pipe. It did a great job for the SLC, but barely touched the concrete.
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Old 04-12-2014, 12:19 PM   #11
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Toilet Flange Dilemma


Quote:
Originally Posted by Ghostmaker View Post
Chisle the concrete it is no big deal
I think I'll try this a little to see how it goes. Thanks.
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Old 04-12-2014, 12:22 PM   #12
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Toilet Flange Dilemma


Quote:
Originally Posted by TheEplumber View Post
Plumbers chisel all the time. Or cut the hub down to 1.5"
Dont glue inside a 3" pipe though
I found a flange at Home Depot that slides inside, but has a gasket instead of gluing it in. You can see it here. What do you think about that?
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Old 04-12-2014, 12:23 PM   #13
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Toilet Flange Dilemma


Quote:
Originally Posted by cleveman View Post
I believe I went on the inside of a 3" pipe, if such a flange is available. It was something I left stubbed up and came back a number of years later and installed a toilet.

I don't know of any troubles with the installation. The 3" pipe probably drops right into a 4" because it is near where the sewer leaves the house and I had a length of 4" pipe there with a lot of stuff emptying into it.
Thanks! I'm pretty sure I'm 3" all the way.
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Old 04-12-2014, 12:26 PM   #14
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Toilet Flange Dilemma


Quote:
Originally Posted by oh'mike View Post
On a 3" pipe--always use an out side flange---the inside flanges have a small opening--often the toilet outlet horn will hit the flange --and not allow the toilet to seat---get out your chisel---
HaHa! I hear ya. Do you think it's acceptable to cut the flange shorter? Maybe chisel out a little more but also cut the flange shorter. I've seen other types of flanges with shorter necks so I'm wondering how important the length of the neck is.
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Old 04-12-2014, 12:41 PM   #15
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Toilet Flange Dilemma


Quote:
Originally Posted by jonhayden
I found a flange at Home Depot that slides inside, but has a gasket instead of gluing it in. You can see it here. What do you think about that?
I highly discourage inside flanges on 3" pipe.
Firstly, 3" is the smallest allowable size per code.
Secondly, as stated in a post above, often times the inside flange will not let the toilet seat properly. You won't know this until after the wc is set, then your back to square one- installing the proper outside flange.
Don't dodge 20 minutes of chipping time by getting the inside flange- it's not worth the risk-IMO

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