Hi! I'm new to the board and am looking for information on products that help even old sub-flooring. I have redone the kitchen floor and would now like to do the hallway and another adjoining room. Where the two floors meet there is a half inch difference and then continues downward slope. Instead of completely tearing out, is there a product that will level out and adhere to wood? I new a this remodeling stuff , so any info would be appreciated! One room at a time is all I can manage at one time. Thanks- Red