I am tiling a bathroom for the first time. It is an upstairs bathroom so I pulled out the vinyl and luan. The subfloor met the standards that I found else where on this site. I laid hardibacker board with total flex thinset and then screwed it all down. I then taped and used thinset on the joints. I started laying my tiles yesterday and everything was going fine until I reached an uneven spot. It is at the sink area on one of the joints. I have sanded that area down as much as possible, but the tile is still able to make a rocking motion when I lay it down without any thinset. I already cracked one with thinset on it when I tapped the block with my rubber mallet. So here is my question, how do I make sure the tile does not crack? Do I build up the thinset in the low areas? Wouldn't that make the tiles higher than the surrounding tiles?
Edit- this is the case for 1 tile only
Thanks,
Tiffany
Best Answer
Your floor must be flatter period. You must fix that issue before continuing. This has nothing to do with thinset or anything else. Thinset is not used to build up the subfloor, it is used to bind to it and create flexibility.