Flooring Tile - Marble Tile over radiant floor

I am getting ready to lay a new floor in my kitchen, which is a concrete slab floor with radiant heat in it. I am going to lay marble tiles. What, if any, steps do I need to take because of the radiant heat in the floor? The slab is old, (~20 years). Just wanted to make sure I wasnt about to make any big mistakes...
Thanks
Brian

the first thing you would want to do is check the slab for any moisture,you do this by taking 6 mil plastic cut it into 1 foot by 1foot squares and duct tape them to the floor making sure they are air tight.You need one for 100 square foot of floor space do it at opposite ends of the room.Tape them to the floor and let sit for 24 hours check to see if any moisture is present under the plastic.If there is a lot of moisture then you want to do a calcium chloride test to find out how much moisture is in the slab cause that will determine if you can do tile or marble safely or not.

If that is not an issue then make sure there are no cracks in the area to be tiled and if so then you need to use a crack isolation membrane to isolate the cracks,here are either elstomeric membranes or the roll on type,like painting or trowelable ones as well.

Just curious though about the marble are you set on that?The way marble reacts to different cleaners and chemicals doesn't make it very practical for kitchen usage,i'm afraid it may be very high maintainance and you may not like the results after a year or so especially if children are in the house wreaking havoc on the marble as only kids can do.Maybe a nice porcelain tile or good hard bodied ceramic may be better suited.Sorry but i had to bring that up.

Get back to us and let us know:cool: