Radiant flooring under natural stone
We are replacing the pedestal sink on the children's bathroom, so we decided to go ahead and change the vinyl flooring, add radiant heat, put natural stone, and also replace the old toilet. We will not mess with the shower area, other than replacing the shower itself, and add a fresh coat of paint.
Now, the bathroom in on the main level, we have a basement, so the flooring is not concrete. Here is what I am not sure about:
- do I need to use an underlayment such as Schluter Ditra XL?
- if I need to use the underlayment, the order of things are: thinset, radiant mat, thinset, underlayment, thinset, tile, grout?
- is it recommended that I add a waterproofing membrane around the toilet?
Thank you. Be well