Roof Overflow Scupper

Permaspan roof to roof expansion joint.

Roof overflow scupper.

Where you have roof drains you are also required to have overflow drains. Roof drains from zurn include combination primary overflow control flow dual outlet siphonic retrofit and more which cater from educational to commercial needs. Cast iron w flashing clamp flange. 25010 downspout nozzle.

Scuppers will play one of two roles in a roof system. The scupper is locked and soldered to the closure flange on all sides. Rough bronze w wall flange. Permaspan roof to roof detail drawing dxf 249 76 kb permaspan roof to roof detail drawing.

Green roof drain overflow drain large sump flange. Scuppers shall not have an opening dimension of less than 4 inches. They will either be a part of the primary drainage system or they will be a part of the secondary overflow drainage system a primary drainage system is designed to remove water from the roof as quickly as possible. The detail shows an alternate method of constructing either type of scupper.

An overflow drainage system will be designed to function independently of the primary system to drain water from the roof. The familiar prescriptive option from prior model uniform building code to simply make overflow scuppers three times the area of the roof drains and position them two inches above the low point of the adjacent roof is gone. Scupper retrodrains detail drawing dwg 651 58 kb scupper retrodrains detail drawing dxf 686 85 kb. Home articles overflow drains and scuppers roof drainage.

21500 q91 roof drain. Green roof type with perforated standpipe. Flat roofs that do not drain over the roof edge and roofs that have parapet walls must utilize roof drains to get the water off the roof. In its place are performance requirements to size and position the scupper to prevent the depth of ponding.

The sides of the flange are sealed against the masonry. 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. 21500 rdg1 roof drain. On the roof side overflow scuppers can be detailed similar to detail 10 5d.

When scuppers are used for secondary emergency overflow roof drainage the quantity size location and inlet elevation of the scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by section 1611 1.