For your concrete base follow our recommendations.

1.  Excavate your site depth of 6"minimum.

2. Fill your hole with gravel 3/4".

3. Make the form for your base the exact size of your models.

4. Make sure that your base is levels.

5. That your base is of square.

6. Do not pass the trowel on contour.

7. Is necessary that the base is 6" higher than the grass very import.