Patio sub structure and lavel
I'm planning several interlocking patios. The first will be about 250 square feet and L shaped. My soil is clay and I will put down 6+ inches of compacted gravel/sand mix.
Should/can I put down a level layer of gravel/sand mix and compact followed by a 1-1/2" layer of concrete sand. Should I level the substrate for draining or will it be OK to grade the top sand layer?
How is this normallly done? When do you grade for water flow?
Last edited by 034139; 04-18-2011 at 10:05 PM.