porches out of concrete
Take the length times the width and devide by 80 for a four inch [4 "]thick slab.
Devide the number by 70 for five inches [5 "] and by 60 for 6" [6 "].
The number left is the amount of concrete in yards you will tell your Ready Mix Concrete Company.
Remember, due to uneveness in the substrate and other un-see-ables, add a half a yard to the load.
The cost of the unneeded material is nothing compared to the headache during and after of being a wheelbarrow short.
Brian T. Chaffee
Custom Stamp Concrete