Ive heard a number of stories as to what to use what not to use to build up in order to level things off. So far I have not run into a job that required a large buildup of say... more than a 12 or 18" inches. With the exception of a small landing and steps we just did. Anyway, my question is... when you have a large patio that needs to be backfilled 2, 3, or 4 feet in some cases what material and method do you use to accomplish this. Ive heard "NEVER" use top soil, always use stone. Ive also heard, its ok to use top soil as long as its not sandy, up to a certain height, compacted frequently then, a good 8 inches of Crusher Run or equivalent sub base. Again, whats been your experience and what do you do to accomplish this?