Can you help me? I have a 1870 stone farm house and have dug out the old dirt floor and now I want to pour a concrete floor. My question is what would be the best thing to do and in what order should they be put down. I will put down about 2" or so of gravel and I heard it would be a good idea to put down styrofoam about 1" and then plastic berrier and than the concrete. What do you think?