I put the electric in floor heating just under the kitchen table where peoples feet will be or maybe some kids want to play.
By the time you put the wires, thinset and the tile you raise the floor about an inch.
I was then left with the problem of getting the rest of the kitchen floor and diningroom level with the infloor heating bit.
I added 3/4 plywood all around to bring all floors level and will still have to add 1/4 inch flooring.
Then started to worry about too much weight on the floor joists. Had a thread on that problem about a year ago and most guys felt the joists could take the weight or I could double them up where the weight is greatest.
I would not do it again to much work.
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