Wood Laminate Floor


When installing a floating wood laminate floor, do you need to lay down the moisture resistant plastic?

When installing a floating wood laminate floor, do you need to lay down the moisture resistant plastic as well as the foam sheets? I thought you did, but the guy that sold me the wood flooring insisted that the thick foam matting was all that was needed. Any advice would help. Thanks.

If you lay it on concrete, you must use the barrier
If you lay it on subfloor the foam is enough

How to lay Laminate Flooring