For years in my shop stoves I have been using clay kitty litter to insulate my firebox floor. The shop stoves are huge having a 28 inch wide x 44 inch deep x 34 inch tall firebox. I can load huge pieces for a 12 hour plus burn when I am away at work. I fill the floor evenly to about 4 inches of material and just shovel it out on the annual clean. Firebricks are expensive also break easily when loading big pieces in the box.it costs a out 16 bucks for the four bags it takes verses firebricks at 6-8 bucks a piece.
I did not want to put any wet or moist material to cause oxidation on the steel floor. Sand, dirt or rock locally has lots of moister in it. The clay, being a natural material, also doesn't mess with the area i dump ash in as well.
You could just use regular brick or rock if that is you goal. Gravel would work too. It will all turn to cracked and broken gravel by the end of a season anyhow. I don't know how you would remove the ash from kitty litter but I expect it would be the same if not easier to clean pea gravel.
I think he wants to soak up the ashy mud and have it clump up when he takes his daily piss next to the stove - or when he spills some coffee or something viscous and can replace it right quick.
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Search "just a box of dirt forge". JABOD forge.
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