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We are going to put hardwood floors down on existing concrete floors.We know that the floor has is not all even and were wondering what would be a good base to put down. My boss believes that two layers of ply wood would be best. One layer of 5/8 and another layer of 3/4 on top equalling 1 1/4 inch. I think that 2by 4 pressure treated will do the job. We are using self levelling concrete first. The ply is around 1000 dollars compared to the cost of the 2 bys. Personally I think that the hardwood floor installer is just lazy and doenst want to land his joints on the 12 inch centers. Any suggestions would be helpfull. I realize i get paid by the hour i just want to do the right thing!