Hi...
We're thinking of putting one of those engineered wood floor systems down in our basement (Easy-Lock at Lowes). In that area of the store, they had samples of the flooring, and then they had 2 grades of vapor barrier. The low end was basically just a sheet of plastic; the high end was a sheet of plastic with some felt attached to make the floor spongier. The latter bit puzzled me a little - if you really expect a moisture problem, wouldn't the felt just trap it and become a mold factory?
Thanks
-Mark