Making patio paving appear flush with lawn?

You want them flush with the top of the gr or higher , If you have it flush with the base the gr will always grow up to be higher than the patio slab , and how often do you plan on cutting the gr ? another thing is that you probably want the water to flow into your yard instead of coming into your patio and don't worry about the edge when you're cutting the gr , you can take care of that with a weed eater or an eder , if you don't have any of those you can just clip the edge with a scissorsesigned for cutting gr .