How do I Calculate the Fill for a 16 X 8 Concrete Block With Sakrete?

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Sakrete is a powder cement mix including sand and gravel that only requires the addition of water for use. Homeowners can mix one bag at a time or several bags in a batch for larger jobs. Sakrete is a high strength mix for applications of over 2-inches in depth. Calculate fill areas by obtaining the total cubic feet of the area and dividing it by the yield per bag of Sakrete.

Things You'll Need

  • Calculator
  • Multiply the width times the length in feet of the area to fill. For example, a 16'x18' fill space will require you to multiple16 times 8, which equals 128.

  • Multiply this number by the depth of the concrete project in feet. For example, a 6-inch deep concrete block is 1/2-foot or .50. Multiply 128 times .50 to obtain 64 cubic feet of Sakrete to fill the block.

  • Divide the cubic feet of the project by the yield per bag of Sakrete. Forty pound bags yield .30 cubic feet each. Divide 64 by .30 to obtain 213.33 bags to fill the area. Round the final number up to the nearest whole number. So, for this example it will take 214 bags of Sakrete to fill a 16 x 8 x 6-inch block.

Tips & Warnings

  • Mix the Sakrete according to package instructions to obtain the correct yield per bag and for the entire project.
  • Add cold water in warm temperature or warm water in cold temperatures to help the mix cure quickly.
  • Sakrete is available at home improvement stores in 40, 45, 60, 80 and 90 pound bags. Refer to the yield chart on the package instructions to obtain the correct fill amount.
  • Adding extra water will stretch the yield per bag, but it takes the product longer to cure and makes the concrete less strong and subject to cracking.

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References

  • Photo Credit concrete image by Empath from Fotolia.com
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