I have old fashioned 12" vinyl tiles on mine. Relatively cheap, and ok to use over wood. (I put mine over concrete). I think they are fire rated (thought they were full of asbestos at one time, not sure if so any longer).
By no means is this a fire proof floor, but maybe fire 'resistant'? (fire resistant is about as good as you can hope for in a wood structure) Concrete and metal if you are doing a lot of welding.... $.02
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