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Wed Feb 15, 2006 2:27 am
how do i fine how much concrete to bye for a ft'ing that is 4 " thick bye 16" wide bye 15' long! what is the linear ft. of this ft'ing?
Wed Feb 15, 2006 7:33 am
You answered your own question . . . it's 15 linear feet long.
To figure the concrete needed for the footing, we can:
1) Convert everything to feet.
4" / 12" = 0.333 feet,
16" / 12" = 1.333 feet, so:
0.333' (4") x 1.333' (16") x 15' = 6.66 cubic feet (ft^3) / 27 = 2.47 cubic yards.
2) Convert everything to inches.
15' x 12" = 180 inches, so:
180" (15') x 4" x 16" = 11,520 cubic inches / 1728 / 27 = 2.47 cubic yards.
Add a 10% increase in case your forms aren't perfect and you have a grand total of 2.71 yards needed.
Most concrete companies won't charge you for a "short load" if you order at least 3 cu. yards. If you need to pour something else that's small, now's the time!
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