I’ll be laying LVP on a wooden subfloor, which is above a conditioned crawl space. Carpeting was pulled up, and there was no other flooring on it but carpet. I believe the subfloor is 3/4” plywood.
I’ve been trying to find out if I need to put down 1/4” plywood over it, staggering the joints, or just put down some type of rolled-out underlayment or vapor barrier. And I see both recommended doing some web searches.
Anyone have any experience with this? I’ve dragged a 4’ level across the floor, looking for ridges or dips, and didn’t find any with the exception of a couple seams that I power-sanded.