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Most codes require specific measurements for the density of a construction grade bale. The code I work with calls for a bale density of at least 7 pounds per cubic foot of material. The bales I use measure 18″ wide x 14″ tall x 45″ long and weigh roughly 50 pounds. Many bales measure 18″ x 14″ x 36″ and weigh between 40 and 45 pounds. These numbers are for two string bales. To calculate the density of the bales I use, follow the formula below:


Multiply 18*14*45 = 11,340 cubic inches

Divide 11,340/1728 = 6.5625 cubic feet

Divide 50 pounds by 6.5625 cubic feet = 7.62 pounds per cubic foot

You can substitute your bale measurements and weight into this equation to calculate the density of your bales no matter what size they are.

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About the Author

Andrew Morison is a licensed contractor specializing in straw bale and green construction. He has shown thousands of people how to build their own straw bale projects through his comprehensive series of instructional straw bale, concrete foundation, and plastering DVDs. You can check these out at http://www.LearnStrawBale.com.

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Categories: Baling