I started to say something because I always think of floor tiles and ceramic tiles, but then I put ceiling and tiles together and realized there is such a thing and it is quite common.
Are those accoustic tiles? I'm guessing you are going to get something that will handle the higher humidity.
I'd be happy to help if can. I work for Bell, - no I mean SBC, no its the new at&t anyway, I work a lot of hours.
I was a plumber a long time ago and I played (guitar) in New Orleans for a few years, so if you need plumbing or entertainment, I'm your man.
Tony