Our two AP stacks sit on plywood, with 36" tall enclosures as the bottom-most cages. I can't remember if one has UTH or both are RHP-only, if there is heat tape under the one, we've got commercial linoleum floor tile as a spacer between the enclosure and the plywood (found a case of the tile on sale), which is what we do between cages in the stack.

We use 12" heat tape and 12"x12" tiles, cut a 1" strip off the tiles, the narrow strips go along one long edge, the wider pieces along the other, leave gaps as necessary for cables. I can't remember if we stuck the tiles to the underside of the cages with the double-sides tape Reptile Basics sells, or just set it in place on the one below.

I should have taken pictures while we were building the stacks.


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