Hello! I live in an old house. We are covering the entire house with click vinyl plank flooring. The entire house currently has old hardwood floor except for the kitchen. The kitchen has hardwood floor, but is covered by some sort of hard, gray surface (moisture barrier?) that appears to be glued on, plywood, and two layers of vinyl flooring. This creates about a 1/2 inch difference from the rest of the house. Should I attempt to rip everything out to make it even? What is your recommendation?