ceramic tile over OSB

[emely]

am building a timber frame home. have radiant heat installed in concrete basement. will have radiant heat under main floor which is 1"OSB subfloor. house is insulated with Sipco. basement is eco-foam block.

can i install ceramic tile over a layer of felt paper over the OSB? or should i use hardiboard or cement board? don't want the tiles to crack but don't think i want the radiant heat to go through another 1/4 to 1/2 layer with the layer on top of the OSB.

any ideas appreciated. thanks

 

[HandyJon]

The ideal way for underfloor heating is to embedd it in a screed floor. This proivides the thermal mass that makes underfloor heating work well. So rather than have the heating under the floor I would put it over the floor. A screed of about 50mm (I think that's about right) on top of the OSB should be adequate. You won't need insulation under the pipework either to keep the heat going into the floor above rather than the down through the ceiling.

 

[emely]

Thanks Handy Jon.
so, your suggestion is to put the wire on top of the OSB, then the tubing, then the hardiboard or cementboard [1/4 or 1/2?] and then the ceramic tile?

Interesting. i will surely consider that option. am i understanding correctly?

Thanks