We just added on to our house and decided to use I-joists for our flooring system. I'm now finishing off the basement. I've painted the bottom and side of the I-joist and want to know if there is some kind of ceiling tile with interlocking ends that I can just set on the bottom lip of the I-joist and then interlock the ends, eliminating a need for any type of grid. I would like them to stand up to moist conditions and provide some sound barrier. Any help anyone can give would be greatly appreciated.