A patio subgrade must drain at 2 percent away from the building for 20 feet. What total drop is required?
Correct Answer
C) 4.8 inches.
Two percent means 0.02 foot of drop per foot of run. Over 20 feet, that is 0.4 foot, or 4.8 inches.
Why This Is the Correct Answer
Two percent means 0.02 foot of drop per foot of run. Over 20 feet, that is 0.4 foot, or 4.8 inches.
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