I need some "professional" advice ... not just another "I think" opinion. Our house is 40 years old; concrete slab. In one room, I pulled up the carpet, and then scraped up the vinyl/linoleum tile squares. The floor is smooth, with some old glue residue left on the slab (won't scrape off). We got a really nice laminate that we like. I don't remember the brand, but it is a top brand sold at Lowe's and has a 100 year guarantee. What I really want to do is to glue it directly down to the slab. I've asked at Lowe's, Home Depot, Lumber Liquidators, and searched online. Here's my issue ... all agree that you never put hardwood directly on slab, but that engineered may be okay, and all agree that laminate can be installed directly on slab. That's where the agreement ends. LL said that it's fine to glue the laminate to the slab ... the glue becomes a moisture barrier. Others say to glue down an underlayment first, then glue the laminate down to that. My wife was at Lowe's the other day to see which trowel they recommend for the glue, and a "professional" floor installer was in there at the time and said that in 25 years of working floors, he would "NEVER" glue laminate down to slab. He said to put down underlayment, :hide: and then install the floor "floating" - which I really didn't want to do because of the noise - every one I've walked on makes this hollow "clack, clack, clack" noise when you walk on it. I've been following the House Repair site for several years now, and trust you guys. So, please tell me the right way to put this down. Can I glue it down, or not? Thank you in advance, and God bless!