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toiking 08-16-2012 08:35 PM

Toilet flange gap repair
Hello everyone!

In order to install/anchor a new toilet flange correctly I plan to pour cement to fill in the space between the drain and the existing concrete. This should prevent toilet leak from entering below the tile and slab.

1. Since the ABS turn is visible and only partially under concrete, can I pour concrete directly on to of the ABS? Or should I put a layer of sand in between?

2. For concrete, which type should I use?
Hydraulic cement? Anchoring cement? Quick-drying?
Anchoring cement would seem to be the best choice to hold down the flange bolts but I'm concerned about its expansion properties putting pressure on the ABS turn.


how2do 08-18-2012 10:53 AM

Toilet Flange Height?
1 Attachment(s)
Hi Toiking,

Just curious but what kind of toilet flange are you planning to use? Glued In, Slip In?

You do know that the lip of your toilet flange should be level with the finished order to limit the amount of space between your toilet's waste hole and the flange....

I looked at your pictures and it looked like the top of the ABS pipe to the top of the tile is about an inch....

As far as what type of cement to use...any type will do as long as you will be making the correct height install of the flange...Most leaks occur due to improper installation of the flange to begin with and alot of the times even plumbers I know have used two or three wax rings to 'fix' the problem.

I am attaching a cross-sectional pic of the correct install height for you..


Alan 08-18-2012 11:01 AM

Depending on the flange you use, Tom's idea above may or may not work.

I'd also like to ask : What the heck happened to that pipe?

toiking 08-18-2012 12:46 PM


thanks for your response.

There an outside 4" flange that was removed.
Because of the depth, I was thinking of replacing with either an extended inside 4" or a Push-Tite. To bring the flange above the floor as pictured, I guess I would have to pour the concrete to tile level.

Alan 08-18-2012 02:45 PM

I'm not really sure exactly what's going on with the pipe, but it looks like it needed to have some more work done to it before the floor was tiled. . . . :eek:

ben's plumbing 08-18-2012 05:47 PM

that is a hub with a broken off peice of pipe inside of it....not sure what your trying to do...

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