How high above sub-floor should pipe for toilet flange be left when tiling?
We're going to install a tile floor over Ditra in our remodel in progress bathroom. We have 4" abs pipe going up to the toilet and plan to install a flange that slides inside the 4" abs flange that installs inside the pipe. It's an Oatley with a stainless steel ring and knock out center. The plumber who installed the piping cut the pipe off flush with the plywood sub-floor.
My concern is that the flange fitting with a typical tapered interference fit will not "glue up" properly when installed on top of tile another 1/2" of so above the sub-floor. When I dry test fit the flange 1/2" from seated it seems very loose and only comes tightish when seated.
It's not too late to go down below, cut off the 4" abs, insert a coupler and add a longer piece above. Does that sound like a good ideal or might one of the expansion based flanges be a better idea. Install tile slide in flange. Tighten up expansion screws. set toilet and be done?
Thanks for any informed replies
Install one like this and it will be more then long enough and can be slid out if the floor ever needs to be redone.
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