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The weight of a 4x8x20 beam depends on the material it is made from. For example, a standard wooden beam (such as a Douglas fir) typically weighs around 30-35 pounds per cubic foot. Thus, a 4x8x20 beam, which has a volume of approximately 5.33 cubic feet, would weigh around 160-187 pounds. If the beam is made from a different material, such as steel or aluminum, the weight would be significantly different.

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1mo ago

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