Underlayment over concrete floor - best one?
I will likely float Kahrs engineered wood and wanted to find out which underlayment worked well so I'd have a solid sounding floor. I was going to get basic foam, but then at Home Depot I was told this plastic with foam bubbles on the topside worked very well. It seems like the plastic may crinkle but I was told it's much better than straight foam. Any experience? Or is felt with a plastic layer the best option?