What is a scupper downspout?
Description: Scuppers are used to provide an outlet through parapet walls or gravel stops on flat and built-up roofs to allow drainage of excess water. They can be used in conjunction with gutters and downspouts to divert the flow to the desired location.
What is a roof scupper drain?
A roof scupper is a drainage system for flat roofs that can’t rely on sloping to naturally move water through a gutter system. Scuppers are essentially small devices that work by giving the water a mechanism through which it can escape the roof without passing through the interior of the building.
How do scupper drains work?
In short, a scupper is a detail that provides drainage to a roof system by allowing the water runoff from the roof to exit the roof through a metal edge, parapet wall or through the deck into a downspout or leader not run through the interior of the building.
Where do roof scuppers go?
When installing scuppers in your wall or roof, wood blocking beneath the flange provides a solid surface for the flashing to fasten to. To ensure optimum drainage of water, space each scupper no more than 10 feet apart along the roof or parapet wall.
How do you know what size scupper to get?
Roof Scupper Size The only unconditional guideline for scupper sizing provided by the code is that “scupper openings shall be not less than 4 inches (102 mm) in height and have a width that is equal to or greater than the circumference of a roof drain sized for the same roof area.”
Do scuppers need downspouts?
Overflow drainage scuppers are typically holes with no downspout or other intricate designs. This is because these scuppers are specifically designed to remove water when there is a blockage in the primary system.
Do roof drains need traps?
Floor and area drains connected to a storm drain shall be trapped. Exception: Traps shall not be required where roof drains, rain leaders, and other inlets are at locations permitted under Section 906.0, Vent Termination.
How do you size scuppers?
The only unconditional guideline for scupper sizing provided by the code is that “scupper openings shall be not less than 4 inches (102 mm) in height and have a width that is equal to or greater than the circumference of a roof drain sized for the same roof area.”