I just bought my first house and during the fall and winter I have dreamed of "building" a patio in the back yard. At this time there is what use to be a cement slab on the side of the house that has grass growing all over it and parts are embedded into the ground. I thought I saw a patio product that can be laid on top of exsisting cement. Do you recommend that or what other alternatives do I have? Patio tile? Please help...