What is the raised structure designed to channel or direct surface water on a roof called?

The structure designed to channel or direct surface water on a roof is known as a saddle. A saddle is typically a raised formation placed at the highest point of a roof where water can flow down to the edges, allowing for better drainage and preventing water accumulation. This is particularly important in areas where multiple slopes meet, as it aids in managing water flow efficiently across the roofing surface.

While gutters are also critical components in rooftop water management by collecting and guiding rainwater away from the building's foundation, the term specifically refers to the channel itself that carries water. A sump, on the other hand, is generally a pit or reservoir designed for collecting water, especially in lower areas, rather than directing it on the roof. Flash is a material used in waterproofing around roof penetrations and seams but does not serve the same purpose as a saddle in managing the flow of surface water.