Sub floor Systems for concrete and slab on grade floors will help to keep moisture out of your finished basement. The water resistant poly membrane is installed with its dimples down to create an air space above the slab. It can be covered with laminate
If it's not a dry basement, I would probably put a sub floor in. I don't know if a moisture barrier is actually good as it could actually trap moisture under there that would accumulate over time. DryCore subfloor for example has channels underneath that eventually
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