Hey guys I've just finish digging all the dirt on the side of my house. It was painstaking work lol. I manage to dig at least 6-7 inches deep. I did some research and I heard it's best to have a one inch slope for every four feet. I'm planning to spray the whole thing with round up. Then I put garden plastic over it to prevent future grass from growing. Then I plan on to put small pebbles and some rocks as a base. I'm also planning to put polymeric sand over it. I heard the shape act as a interlock making it stick together. However, I have yet to find a site that tell you to leave something around the edge of the working area to prevent the sand from flowing out if it rains. Should I build a concrete around the edge so the sand won't get out?