For your base concrete to follow our recommendation

1. To excavate your site a depth of 6"minimum.

2. To fill your hole with gravel 3/4".

3. to make the form for your base of a size exact of your model.

4. That your base is levels.

5. That your base is of square.

6. Not passed of trowel to contour.

7. Is necessary that the base is 4"higher than the grass very import.