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The cost of pouring a separate footer and slab is high, (Two pumps. trips etc) so I am looking at pouring a monolithic turn down slab with footer just enough to support a simple shed roof that can cover 20 X 20 patio. I am NOT building a two story, just a simple roof for a screened porch. I live in Greater Atlanta area

My questions are: 1) What should be the size of the footer of the monolithic slab? 2) Any disadvantages of a monolithic slab? (Crack etc). Thanks
This is what we use here in Florida. If you need side support, same sized haunch around all three sides. That's a 45 degree slope. Three #5's.
 

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