PSA: I quit laying plastic on every concrete slab
For a long time, I did what everyone else did and put down a plastic sheet before flooring on concrete. The common advice is to always use a moisture barrier. But I started skipping it when the concrete was fully cured and passed a moisture test. At first, I was worried about problems, but after many jobs, I haven't had any issues. The flooring sits better without that extra layer, and it cuts down on material costs. My clients don't see a difference, but I notice less movement in the planks over time. Maybe it's just me, but I think we use plastic too much. Now I only use it if the test says to, and it's working well.