I am going to be laying 1800sqft of sod next week, and am bringing in 3" of soil for ground prep. Do I need to till in the "Sod Soil" in, or should I just spread it out, level, and lay the sod? The soil is pretty good for Tucson Arizona, and I was thinking that tilling the new soil could be just a waste of time. I am new to laying sod, and on the first job I did, for a friend, we just spread out 2" of manure and layed the sod. The sod looks great a year later, so is tilling a waste of time?