We have had some many problems with our build and here is another. We decided to use solid 3/4 hardwoods over a routine subfloor of plywood. We now want to use stone travertine in the kitchen. No additional subfloor was added under the hardwoods. How high will my kitchen floors be now? I have 16 inch stones and they seem 1 cm thick. How do I proceed now? IS there a way to use thinner materials to not have the floors so unlevel?