![]() Two-way structurally sloped roof decks with roof drains above the low point.The roof system’s transition to the gutters.In this article we’ll look at four key conditions on the roof that I see as the most erroneously conceived and installed: It also allows for ice to form in winter, creating life safety issues as well as external forces affecting the roof cover. (See Photo 1.) Additionally, water on the roof promotes algae growth that can attack some materials. If breaches in the roof membrane exist, standing water can result in excess moisture intrusion. Ponding water provides visual evidence to the owner that something isn’t quite right, and in some instances, it can result in roof structure collapse. A lack of knowledge by designers, a “roofer or builder will figure it out” mentality, and poor installation procedures can all be to blame. There are many reasons for this degradation of roof system design, including ignorance. It is not uncommon to walk upon recently installed roofs and see ponding at gutters, roof drains and across the roof. Along with many indigenous building methods, the movement of water off roofs and away from buildings is becoming a lost design element. Moving water off the roof was important to builders 700 years ago in Europe, just as it was to the builders of Machu Picchu and Angkor Wat. How they even made it into place is amazing, but to those like us who think in terms of water, what is even more amazing is the carved-out drainage channels. ![]() The roofs of the transepts are large stone slabs: 5 feet wide, 10 feet to 12 feet long, and 8 inches thick. The stone church in rural Portugal was constructed some 700 years ago. Roof decks with poor slope, drains that are up slope and deck defection can result in excessive ponding. ![]()
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