Lumber Liquidators, Oklahoma City, OK said to trowel down this Bostiks MVP4 moisture barrier; 5 gals x 2 = 333.98 and it would protect the wood floor from any ground moisture coming through the concrete slab. He promised to put in writing which I did not get. I had reservations about buying solid wood because of problems heard putting this floor on concrete. The sales guy Brandon Banks, assured me there would no problem if I used their moisture barrier. It failed after 2 months and the floors cupped and crowned in 2 places. It had no rained... read full review »