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concrete slab

1470 Views 5 Replies 3 Participants Last post by  GarageGuy09
hello all, I am in the midst of building a concrete slab foundation for my new garage. I have dug out the site, put up my boards, and have dug the trench for my footers around ther perimeter, but what I need to know is how to backfill on the outside of the boards so that the cement will not flow out underneath them. There is a wide gap at the back corner where the ground landscape is very low in comparrison to the other side. I also need to know how much cement to order if the pad itself is going to be 6 inches thick, but i have to account for the cement which will fill the trenches around the perimeter.
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the slab is going to measure 22feet long by 18 feet wide, with a top depth of 6 inches, not including the trenches ie footings, this works out to 7.3 cubic yards, now how would i calculate the footings?

so I fill the gaps with more boards, brace it, then backfill over it to meat the top of the forming boards, then once the concrete has cured, dig it out and pull the boards off? Seems like a lot of work for something that has to be taken apart again. Are these steps correct?
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