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When sizing and designing a roof drain system, any wall that diverts water onto the roof must be sized as part of the roof, but only _______ of its area is included in the calculation.

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Note: Your licensing exam will be based on the plumbing code used in your area.


When sizing and designing a roof drain system, any wall that diverts water onto the roof must be sized as part of the roof, but only _______ of its area is included in the calculation.






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