For dirt or gravel flooring, you can install any of the footings that are stated in the plans. This includes:
Standard Footing – Standard footing requires that your posts are placed a minimum of 2-feet deep. Concrete should be in accordance with ACI standard specifications for structural concrete buildings.
Caisson Footing with Base Plate – An optional base plate can be used for your footing. This requires a rebar cage and a 2’ wide square by 3’ deep concrete base. If you used a base plate, your posts should be anchored to the base plate using 2 screws on each side of the post roughly 4” up from the base.
Spread Footing – This method uses a rebar base with a 3’ deep and 2’ wide hole.