Hi! Last year we installed a porcelaine floor on a ditra mat on a plywood subfloor at our 3 season cottage in the Montréal area where température can get to -25 celcius and worked wonderfully, no mouvement or cracking. This year we'll do our bathroom but purchased céramic tile. From my understanding the concern with ceramic is thaw/freezer cracking due to moisture, but with a ditra mat seems to me that it shouldnt be a problem. I am just looking for confirmation or rejection. Thanks for the help!!