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Scupper Size Formula:
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Scupper size calculation determines the appropriate size of roof scuppers needed to effectively drain water from a roof based on flow rate and head pressure. Proper sizing prevents water accumulation and potential structural damage.
The calculator uses the scupper size formula:
Where:
Explanation: The formula calculates the minimum scupper size needed to handle the specified water flow under the given head pressure.
Details: Correct scupper sizing is essential for effective roof drainage, preventing water accumulation that can lead to structural damage, leaks, and potential roof collapse in extreme cases.
Tips: Enter the expected maximum flow rate in gpm and the head height in feet. Both values must be positive numbers for accurate calculation.
Q1: What is a scupper in roofing?
A: A scupper is an opening in a roof's edge or parapet wall that allows water to drain off the roof instead of accumulating.
Q2: How do I measure flow rate for roof drainage?
A: Flow rate can be estimated based on rainfall intensity data for your location and the roof area. Typically expressed in gallons per minute (gpm).
Q3: What is head pressure in this context?
A: Head refers to the height of water above the scupper opening, which creates pressure that affects the flow rate through the scupper.
Q4: Are there building code requirements for scupper sizing?
A: Yes, most building codes have specific requirements for roof drainage, including minimum scupper sizes based on roof area and rainfall data.
Q5: Should I add a safety factor to the calculated size?
A: It's generally recommended to add a safety factor of 10-20% to account for potential debris blockage and extreme weather events.