A hot tub room is a swamp. Forget drywall or greenboard. You either need
ceramic over backer board, or more traditionally, some moisture-tolerant T&G
like cedar or something. If that is a budget-breaker, I'd go with one of the
plastic-coated panels, maybe with the faux woodgrain if you like the look,
like they sell for skinning lawn sheds and stuff. Some isn't too bad
looking, as long as the lights are low. No idea what to tell you about the
ceiling-probably the plastic-coated stuff even with cedar walls.
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