jwmII wrote:
A vapor barrier laid down before pouring a concrete slab definitely helps but it is not the cure all you would think it is as the concrete above the vapor barrier will absorb moisture and then give it up so it can attack the tires. The best barrier remains metal or plastic right on the tire footprint occupying an area around each tire.
I'm not a fan of concrete pads here in the great north west, they get algae / slimey and need to be pressure washed every year. plus they are permanent, you can't change them with out a lot of work and disposal fees.
