hey guys, i just have a simple question. ill be builiding a 30x30 patio in a few weeks. my question is i was at the supplier today getting quotes on pavers and wall block for other jobs, and i mention to them that ill be buidling this patio in a few week and we got to talking about the construction process of it,. i usually dig down 8" for raised patios and use 5" of 21aa, and 3" of Slag to construct most patios, well the supplier suggest using all slag instead of 21aa. i was wondering what your opinions were and how you would put this together. in my opinion i dont feel slag is solid enough to build a raised patio base, but i guess everyone does it different.