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tile floor + radiant heat

We had our kitchen + addition/family room ceramic tiled 5 months ago. The floors are adjoining. There is a backerboard subfloor appropriately overlapping the two rooms. There is radiant floor heat in the family room + a kick plate heater under the sink in the kitchen to provide heat. The tile adjoining the two rooms has cracked. Would the different heating + resultant difference in tile temperature be the cause of the cracking? Would installing radiant heat in the kitchen solve the problem? there are no other structural defects that we are aware of. Please help!!

Re: tile floor + radiant heat

if the floor is stable enough and not the cause of the cracking, then the best guess i would have is that the mastic holding the floor down dried out alot quicker on the radiant side and much slower on the kitchen side. the only possible solution i can think of is to replace the cracked tiles when you won't be needing the radiant heat for a solid month or two so that the mastic has time to properly cure under the tiles.

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