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Old 07-02-2012, 11:37 PM   #1
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Subfloor fix and new flange?


I have to replace a flange and some 3/4 plywood around an upstairs toilet. It is a 4" ABS pipe with an ABS/plastic flange. How do I replace the flange/sleeve? Can I insert a flange/insert into the existing pipe or will the smaller size "bottleneck" the toilet waste?

Thanks, Tom

Picture:http://www.flickr.com/photos/5436129...in/photostream

Would this work? Does the flange sit FLAT on the new 3/4" plywood?

http://www.homedepot.com/h_d1/N-5yc1...&storeId=10051


Last edited by trmoore2; 07-03-2012 at 12:18 AM.
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Old 07-03-2012, 12:17 AM   #2
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Subfloor fix and new flange?


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Originally Posted by trmoore2 View Post
I have to replace a flange and some 3/4 plywood around an upstairs toilet. It is a 4" ABS pipe with an ABS/plastic flange. How do I replace the flange/sleeve? Can I insert a flange/insert into the existing pipe or will the smaller size "bottleneck" the toilet waste?

Thanks, Tom

Picture:http://www.flickr.com/photos/5436129...in/photostream
If you have the room, I'd cut back on the horizontal line- put on a coupling, new 90 and flange

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Old 07-03-2012, 12:23 AM   #3
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Subfloor fix and new flange?


What is the "horizontal line? And why isn't a 4 x 3 "sleeve" sufficient?
Like this:
http://www.homedepot.com/h_d1/N-5yc1...&storeId=10051



Thanks, Tom
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Old 07-03-2012, 12:28 AM   #4
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Subfloor fix and new flange?


He's referring to the horizontal part of the drain.
It's never good to reduce the inside diameter of a toilet or other drain.
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Old 07-03-2012, 01:41 AM   #5
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Subfloor fix and new flange?


If the opening at the bottom of the porcelain toilet is only 2 1/4 inches, what difference would 1 inch of 3" pipe make? The new "sleeve" is still bigger than the toilet (bottom) opening, and then after an inch or two, the pipe is back to 4 inches. I'm not a plumber, but it seems like the sheer gravity and expanding diameter of the passage would never be a problem.

Last edited by trmoore2; 07-03-2012 at 02:08 AM.
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Old 07-03-2012, 08:56 AM   #6
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Subfloor fix and new flange?


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Originally Posted by trmoore2 View Post
If the opening at the bottom of the porcelain toilet is only 2 1/4 inches, what difference would 1 inch of 3" pipe make? The new "sleeve" is still bigger than the toilet (bottom) opening, and then after an inch or two, the pipe is back to 4 inches. I'm not a plumber, but it seems like the sheer gravity and expanding diameter of the passage would never be a problem.
According to UPC code, a reduction of pipe size from 4" to 3" at a closet flange is acceptable.
However, the method you want to use is not good - never seen a good plumber use your method either. and it's a lot more difficult then what I suggested.
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Old 07-03-2012, 10:20 PM   #7
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Subfloor fix and new flange?


kind of a old trick of mind cut the closet bend just below were the very bottom of the flange ends get another 4" flange abs NOT a adjustable metal ring type cut the flange approx in 1/2 you will have a coupling and the rest of the flange glue the coup on the closet bend lots of glue allowing enough for you to glue a piece of 4" that u measured top of closet bend after cut to top of finish floor then glue pipe into coup then the flange make sure you secure flange w/brass screws all the holes ,highly recommended let cure 24 hours never had a problem yet, i'm sure i'll hear some sh....t but works like a champ when needed.
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Old 07-03-2012, 10:25 PM   #8
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Subfloor fix and new flange?


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kind of a old trick of mind cut the closet bend just below were the very bottom of the flange ends get another 4" flange abs NOT a adjustable metal ring type cut the flange approx in 1/2 you will have a coupling and the rest of the flange glue the coup on the closet bend lots of glue allowing enough for you to glue a piece of 4" that u measured top of closet bend after cut to top of finish floor then glue pipe into coup then the flange make sure you secure flange w/brass screws all the holes ,highly recommended let cure 24 hours never had a problem yet, i'm sure i'll hear some sh....t but works like a champ when needed.
Nice trick
Curious- why not adjustable ring- rust or another reason?
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Old 07-03-2012, 10:41 PM   #9
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Subfloor fix and new flange?


after cutting flange not saying it doesn't work but the metal ones become much more flimsy.

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