I had an area of bathroom tile that had fallen lower than the rest of the floor. When I started to explore under the 67 year old tile, I found a masonry "sub floor" that is crumbling. Under the masonry is a wood sub floor. My question– Should I remove all the old crumbling masonry and rebuild a sub floor to support my new tile floor? (The old floor has settled quite a bit- at least an inch in the corner.)
Tile – Want to retile the bathroom, but found masonry filling under old tile
bathroomsubfloortile
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Best Answer
You need to get rid of everything under the tile. The bed at one time was probably really firm but as it gets water it will start to break down and those sand bases really don't dry out well once they get wet.
If you need to add height just add plywood but top layer should be cement board.