Marble is metamorphic limestone. It is harder and less porous than limestone. And marble will get scratches and stains like no tomorrow. And etches. Limestone will etch when exposed to acids. Just look at all of the buildings dissolved by acid rain.

Do a porcelain lookalike. Porcelain is hard enough and non porous enough to be used outside and subject to freeze thaw cycles.

You might glean some info from this current discussion going on.

[https://www.houzz.com/discussions/flooring-dilemma-dsvw-vd~4470355[(https://www.houzz.com/discussions/flooring-dilemma-dsvw-vd~4470355)

I'd check with the manufacturer of the radiant heating system to find out what type of flooring that they recommend for most efficient use of the system.

Hello!

I'm wondering if you did select limestone w radiant heat? Do you like it?

We are looking at something very similar for our renovation.

Any feedback re: installation, maintenance, and how it is wearing would be appreciated!

Thanks!

Which limestone is this from Exquisite Surfaces? Thanks!