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Posted by joe on April 9th, 2003 11:00 PM
In reply to concrete foundation by Melanie Butler on April 9th, 2003 08:58 PM [Go to top of thread]

Concrete is order by the 'cubic yard'.

A cubic yard is a cube 3ft x 3ft x3t.

To determine cubic yards you need to determine the amount of concrete needed by thickness x width x depth.

For example, if you will pour a slab 10 feet wide by 20 feet long by 6 inches deep this will equate to:

10x20 or 200square feet
200x.5 (.5 equals 6" or 1/2 a foot)or 100cubic ft

100 cubic feet divided by 27cubic feet (ie 1 cubic yard or 3x3x3ft=27cuft) equals 3.70cubic yards.

Another way to express this same ratio is to express it as 10feet wide x 20 feet long by .5 feet deep or 10x20x.5 or 100cuft divided by 27=3.70.

A wall 10 feet high x 1 foot thick x 20 feet long would be 10x1x20 or 200cubic feet divided by 27=7.40 cubic yards for the wall...

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