BCT Ceramic Floor Tiles Cracking (Pictures)

[Bathfix Bob]

I saw a 12 year old bathroom with polished porcelain dot and dabbed straight onto floorboards riddled with woodworm, not a crack in sight apart from one tile put that was sinking into the void as the floorboard was dust.

 

[Kevbos]

That picture looks like it was done on ply .the ply has shrunk in size .the glue is good so the weak point is the tile and it cracks in a straight line .so close to edges of tile .it's definitely weak tiles and no decoupling membrane