LVP over concrete and wood subfloor - underlayment needed

[Daria B.]

I posted this in another forum area and want to see if it will get some traction here.

https://www.biggerpockets.com/forums/67/topics/678...

Looking for information on underlayment for flooring that will go over concrete and wood subfloor. Even asking the folks at the store I get differing answers. Just trying to get a more narrow down "what is acceptable and what can I get".

Thanks!

[Tim Johnson]

On the instructions they suggest a 6mil vapor barrier on concrete, I would do that.

It says it doesn't need it on subfloor, but I always use it because it reduces the floating feeling of these click together floors.  I also suggest you sand the seams so the subfloor is as flat and smooth as possible