I just ripped up the linoleum (sp?) floor in my kitchen and will tile it this weekend. When i took up the floor I noticed that the concrete sub floor seemed wet (slightly). It dried within minutes of being exposed to the air. I dont know if I have a moisture problem or if it was the chemical used when putting it down...but my question is if thin set is a moisture barrior? If not, what should I use. (or do i need one for tile) btw.. i live in florida thanks

Ok, I have read your forum for several years as I have been remodeling my house. Love it! Thanks for all the advice that I've already taken. I had someone tile the bathtub surround in my bathroom and this is how it was done. I used green board over the vapor barrier on the studs that was there from before; I believe the homebuilder used thin strips of roof shingles. I then applied backer-board with thinset and screws, and then the installer applied the 6 inch tiles to the backer-board with thinset. The installer grouted the corners and the line between tile and tub. Obviously, the grout line next to the tub began to crack. I masked off above and below that line and used a grout and cement crack repair, silicone caulk to cover the cracking grout. After about one year, the caulk peeled up along the tub and allowed water to get back to the grout. I have now removed the old caulk and have cut/broken out the grout along that bottom line. I’m going to let it dry out with a heater for a few days (the water wicked up into the vertical grout lines about ¼ inch) and then I will caulk the now appox. 1/8 – 1/4 inch gap between the tub and the bottom row of tile. I guess I’m looking for confirmation that what I’m doing/was done sounds ok. Thanks for any response, this is an amazingly helpful site.