We're about to put laminate upstairs, and wood down (we have to match what's here). We're going to throw a couple layers of poly on the wood after we get it in. that will take care of the leaking issues. I think they should recommend this -- but I guess they want it to seem as easy as possible, and to heck with you later. We were reading the box on the laminate yesterday and it says we have to lay it over a "shaw" underlayment (that's the brand). So, guess what? If we use the underlayment from the store -- no warranty!! They getcha no matter what. I wonder if I could get the store to put it in writing that they guarantee it if shaw spits it back -- if I use their pad.