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Question:

Unique situation....What is the best way to install cement backerboard on my bathroom floor?

I removed old tile from my bathroom walls as well as the old vinyl flooring. Underneath the vinyl was cement backerboard, which is good. But all around the outer edges where the wall tile used to be, is a 1 inch gap where the floor board are showing. How do I get this gap filled? Do I need to rip up the old cement backerboard and start over? Can I cut small strips of new backerboard to slip in the crevice? Is there a compound I can fill the gap with? Any help out there?

Answer:

Fill it with thin-set. There won't be any pressure applied along the wall. Fill with thin-set and wait 24 hours to dry before installing tile. Just make sure to smooth it out and it's level with rest of the backer-board floor.
May 11, 2017
If you have the backer board yes you can rip it and put it in. If you do not you can use some of the thinset you (should use) are going to put the tiles down with. Just mix it a little more dry than it calls for (not too dry) and fill this area in and let it dry for a day. Then go back and tile away. The only reason I am not telling you to go out and buy another product is that if it is along the wall edges and it is only an inch its a waste of time and money, you will be fine.
May 11, 2017

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