couple of quick questions [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile


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12-26-2016, 01:30 PM
I'm in the process of ripping out a bathroom that was built in 1959, so in major need of an update! I'm to the point of taping seams around the tub surround & putting the durock on the floor. I was curious if there is a certain thinset mortar you guys recommend for each proceedure or a good "catch all"that will cover the whole tile job.

Also, on the toilet flange, should it be fastened to the CBU then tiled around or fastened on top of the tile? I see it done all different ways on video's etc, but curiousa as to which way is recommended.


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12-26-2016, 04:01 PM
The thinset you select is dependent on a couple of things:
- where you live and what's readily available
- the method and materials you are trying to bond

So, it's hard to advise you without a bit more information.

12-26-2016, 09:50 PM
OK, thanks! I'm in Nashville TN, so fairly mild temps here. I'll be setting 12" porcelain tile over Durock CBU, so nothing really exotic.

Tool Guy - Kg
12-26-2016, 10:23 PM
Welcome to the forum, Steve! :wave:

Generically speaking, any decent modified mortar meeting ANSI standards A118.4 or better can be used under your Durock, for taping your seams, and setting your porcelain tile. If you've got large format tile on the floor, or would like the assistance of a non-sag mortar for the walls, that would introduce other mortar. I like the idea of having only one mortar. But if the job is big enough, I'll save a buck on areas that don't benefit from better mortar (like under the Durock) and use the savings for a higher performance non-sag mortar for the walls.

For the toilet a perfect world: the toilet flange would be installed atop the tile. But that's infrequent. Most times, removing and re-installing the toilet flange to the top of the tile isn't in the cards. In most cases, the cement board and tile are installed to 1/4" from the perimeter of the flange (just make sure to leave enough room for the closet flange bolts to slip under the flange). And extension rings are installed on top of the toilet flange so that excessive amounts of wax rings aren't employed in the installation of the toilet.


12-27-2016, 10:10 AM
Thanks! Toilet flange isn't a problem. I've moved the toilet so just have the pipe stubbed out through the subfloor for the moment. I'll post some pics when time permits.

Tool Guy - Kg
12-27-2016, 01:26 PM
Ok, sounds good.

Then make sure to cut some slots in the tile for the screws that fasten the toilet flange down to the plywood floor to pass through. Either that, or be prepared to spend a bunch of time using a diamond hole saw to make holes in the tile for same after it's installed.