Roof ponding: An invitation to roof failure

Flat roofs are susceptible to water accumulation as a result of several factors limiting water drainage.

By Charles C. Roberts, Ph.D., P.E. | October 02, 2019 at 12:00 AM

Flat roof failures.

Flat roofs are utilized on many buildings throughout the country. They offer space on top for rooftop heating and air conditioning units and other mechanical equipment. Inside, they offer a superstructure to attach ductwork, electrical conduit, suspended piping systems and lighting systems.

The term flat roof is sort of a misnomer. The roof is typically pitched slightly to allow water to run off the side of a building using scuppers (channels through parapets that allow water to drain from a flat roof). Flat roofs are also designed to channel water to drains on the roof.

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