For years we have been using CR6, (Crusher Run) as our primary fill for elevated patio surfaces. But in recent years I am hearing more people using 3/4 angular gravel. Some people I have tallked to said they then put down 4" of CR6, then their bedding sand. Others said they use the 3/4" all the way up to their bedding sand layer. In all cases the use of fabric between each layer is stressed. Does anyone use this method or a similar one? and what sort of results have you seen with it? I imagine the benefits would come more into play the higher the elevated patio is.