Concrete footings give structure stability from below the soil movement and from above the soil from the force of the wind. A website that offers a clear concrete footing diagram and explanation of concrete footings is at http://www.construction.com/articles/index.php?news_id=6. This website has a forum you can use if you have any additional questions. If you need a help in calculating a
. foundation, roof area, board footage, or other calculations you can click on the calculators tab. There are also links to available to find contractors if you need one.