Ponding on your roof is essentially just water that collects in a low spot after a rainstorm. It’s a puddle that sits there for a while, eventually evaporating and leaving behind a coating of dirt.

A well-maintained commercial flat roof is crucial for protecting your building and the business inside it. However, the nature of flat roofing — whether made from modified bitumen, polyvinyl chloride ...

Lee Wallender is a home improvement writer of nearly 20 years and specializes in home remodeling, repair and maintenance. Lowe Larretta is former lead editor for Forbes Home, covering all things ...