okay, okay....i know i should go to a DIY forum....but thought i'd ask anway. if you had a question about your water/sewer line...i'd try to help....ooookay, i have a dining/living room addition on my house,that was built in 1982 by the original owner. it has a parquet wood floor. we have AC, so humidity shouldn't be a problem, but coupla weeks ago, i had an area about 4' wide, the length of the room, approx 20' long....that it appears the adhesive let go, and the tile buckled. i got out a heat gun, scraped adhesive off back of tile, sanded down all tile edges, and the floor....cleaned up edges of tile still in place. i'm ready to put them back down, and the guy at local lumber yard says that liquid nails is a good product to put them back down with. he bs'n me? anything else i should be doing here? what are the odds that the rest of the floor heaving?