Internal Roof Drainage

The drainage requirements for flat roofs on buildings present some special problems that we describe and illustrate here.

Internal roof drainage.

Use an insulating fill or tapered insulation for slope. Properly locate roof drains scuppers and gutters to remove water from the roof s surface. Internal roof drains these will drain to somewhere near the center of the roof and down through the building to underground storm mains or a detention pond. At page top and at left our photos show a low slope roof surrounded by a parapet.

The most important factors in roof drain design are. Roofs of this design will have one or more roof drains or scuppers installed. This form of roof drainage is preferred if a clean exterior appearance is desired. Watch for clogs blockage at the roof drain or scupper.

Roof drains from zurn include combination primary overflow control flow dual outlet siphonic retrofit and more which cater from educational to commercial needs. Recess the drain below the roof surface. Properly slope the structural framing and deck minimum inch per foot. Unlike scupper or gutter drainage systems in which water flows off the side of the roof internal systems allow for drains to be strategically placed throughout a roof deck to ensure water doesn t pool.