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?
Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074
Rewards Points: 2,142
Patio sub structure and lavel
If you have interlocking concrete pavers, you put down the base, grade it to the drainage contours you want and compact it to reflect the slope you want. Then, put in a UNIFORM 1" thick layer of concrete sand. Set the pavers with a tight joints and then spread some masons sand and vibrate to even out the surface and force sand into the joints to create the stability and then sweep up the excess. The slope of the pavers reflect the slope of the compacted base.