Toilet flange

[kdesrosiers]

Sorry for the double post. I figured out my question fits better in this specific area " toilet and sink".

Hi, I have a problem with my toilet flange installation. The problem is that I have a normal 3 inches ABS pipe that it is cut flush to the Polish concrete floor. So I had to buy a toilet flange the fits inside the 3" inside diameter. But this toilet flange has a inside diameter of 2.5". My toilet hole (also flanged see picture) has a 3" outside diameter that does fit inside the ABS flange. So it leaves a gap between the toilet and the ABS flange. It would result in my toilet not laying on the concrete floor but floating at 0.25". Should I use a grinder to cut a little bit the ceramic flange on the toilet. Or only use a classic copper flange and only count on the wax ring to seal this?

 

[kdesrosiers]

This is how I did it. I added some PVC glue on the top of the pipe and concrete to make sure that no water could go between the concrete and the pipe, to create a better seal. After I cutter a little thickness of an extra wax I had to place it under the flange before fixing it in the concrete floor. I placed the wax that came with the toilet under my toilet before fixing all this on the flange. So far so good l, time will tell if all this was all right.

 

[Jeff Handy]

I would have just bedded your flange in a good layer of pure silicone caulk, then screwed to floor with tapcons like you did.
Then gone back and fill in all the voids in the flange with more silicone.
Then let dry for a full day.
However, because your floor is so solid and smooth sturdy concrete, what you did will likely hold up well, and if it leaks the water should run out where you can see it.

 

[kdesrosiers]

So far so good. There's no leak. I think my setup is good.

 

[CT18]

If you ever smell sewer gases you will know where to look

 

[kdesrosiers]

Hahaha indeed but I also have an anti-flood valve not too far.