Thanks for your imput yonuh! That does make sense about the mold. I never thought about that! I guess if one's house is on a slab or concrete, there probably wouldn't be any vapor barrier between the floor and concrete, where as mositure could not escape, and then causing mold. As with a house on foundation with a crawl space or a basement, air would be able to circulate a little more to dry out the mositure and hopefully not have the mold problem. Good luck with your flooring too!