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.
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
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.
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.
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.
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.
they make an inside pipe cutter.....do not glue inside 3" pipe ...you will be sorry...trust us ...
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