I have a standard 10 x 10 concrete slab patio. It's settled, the concrete step has majorly sloped, and the wooden steps leading to the sun porch are about to fall apart. I want to cover it over with a nice deck that expands the total porch area of my back yard, wraps around my sun porch, and covers a "dead" area in my back yard. I live outside Chicago, so winter is a factor. So, I know the basics about making holes that go below the frostline. What's the best way to support the area over the concrete? Removing the concrete would add considerably to the cost. I'm wary of anchoring into the concrete and into the lawn because I don't want it to settle awkwardly. Any thoughts?