Purpose Of Roof Overflow Drain

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.

Purpose of roof overflow drain.

The drain may be used to redirect water after it reaches a certain level or serve as a means of effectively maintaining a certain level of any type of liquid in place as part of the manufacturing process. Where you have roof drains you are also required to have overflow drains. The 2006 international residential code specifies the size and locations for overflow drains on residential structures. Roof drains from zurn include combination primary overflow control flow dual outlet siphonic retrofit and more which cater from educational to commercial needs.

We have seen engineered drawings showing overflow drains connecting to the same storm line albeit further down the line but still on the same drain. An overflow drain is also used in manufacturing plants and other commercial assembly operations. Overflow drains shall be the same size as the roof drains with the inlet flow line two inches above the low point of the roof and shall be installed independent from the roof drains.