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How do you calculate the weight of one inch deep of water on a roof covering an area of 20 feet by 20 feet?
Wiki User
∙ 17y ago
Twenty feet times twenty feet = 400 Square feet of area. Divide by 12 to get the number of cubic feet which is 33.33. One cubic foot of water is 7.4805 gallons. One gallon of water weights 8.3249 pounds. So multiply 33.333 by 7.4805 = 249.35 gallons times 8.3249 pounds per gallon = 2075.81 pounds of water on the roof.
Wiki User
∙ 17y ago
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