MarkS
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I suppose it depends on how the fireplace is used - dog grate, gas fire, wood burner, etc - all have different heat outputs, and some will get the base VERY hot.
UFH is only luke warm by comparison. I suppose fire cement wouldnt work?
My woodburner sits on york slabs, on soil with lime mortar. I have a fireplace with terracotta tiles but Im not sure what they are bedded on - it has a slightly plasticy look to it.
Make sure it all has plenty of time to set before they use it.
Re - your other question, I think you do need a wet diamond cutter for decent results. Someone asked about travertine before and got a full answer with lots of info about sealing.
I do know that some fireplace places wont supply a single piece of marble for a hearth because it tends to crack. They do three pieces - one for the back under the fire/stove, then two seperate bits for the front, a left and right half.
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