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How to Measure a Cubic Yard for a Trench Footing

A trench footing is the lowest part of the foundation of a building. Workers dig a trench, line the bottom of the trench with rocks and pour concrete into it. Since the building will rest on that footing for the rest of its life, the concrete pour is usually preceded by detailed planning. One issue that is always considered is how much concrete to pour. Concrete is sold in cubic yards and a concrete truck delivers about eight yards of concrete per trip.

Things You'll Need

  • Steel measuring tape
  • Calculator (optional)
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Instructions

    • 1

      Measure the size of the trench footing with a steel tape measure. For example, a trench footing in a warm climate may be one foot wide, 30 inches deep and 40 feet long.

    • 2

      Multiply the height by the width by the length of the trench. In our example, we must multiply 1 X 2.5 X 40, which reveals the trench has a volume of 100 cubic feet.

    • 3

      Divide 100 by 27. A cubic yard, which is three feet wide, high and deep (3 X 3 X 3), contains 27 cubic feet. For this hypothetical footing you will need 3.7 cubic yards of concrete, or about half a truck load.