Ok first off I have a customer wanting a outdoor kitchen with a build in ref. and possibly a roll out trash can. I plan on framing it out of steel studs. I was planning on using 1/2" cement board on walls and then either stone tile or porcelain wall tile available at lowes. I was also considering cement board for countertop and granite tile or possibly travertine tile or porcelain tile on top. I was considering wrapping the top with rubber over cement board to be safe. I don't see where anyone else is really waterproofing the countertops if they are being tiled. So this is why I am mentioning rubber. Has anyone tried this? And what about the walls? Will just cement board , thin set and tile be good enough to keep from water seeping threw? Any other tips anyone could throw my way would be appreciated. Thanks in advance.