I've been using a small fire bowl with impunity on a painted wood deck. Last time around, though, I kept the fire going for several hours and the paint showed some localized discoloration.
I've now purchased a new fire bowl, about twice the capacity, and the directions are pretty clear about not using it on a wood deck. I'm planning to have larger fires, and wondering what I can use between the bowl and the deck that might insulate the wood from the heat. Ideas?