Karhunkoski wrote:And if the logistics of moving a large weight of stones is a PITA, then maybe consider an alternative. I know of two saunas here that use old ceramic electricity insulators in place of the traditional stones.
I think my family has just used any old beach stones/pebbles/rocks gathered from wherever. Yeah, there are recommended mineral types to use but as long as they aren’t overly porous or structurally weak and susceptible to erosion or release foul-smelling toxic fumes, they’re good to go. (The linked company touts their stones are, among other virtues, “easy to install”. Well sure they are: they’re pieces of rock in a cardboard box! How hard could it be?)