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Poor roof drainage can cause accelerated deterioration of a roofing system and in extreme cases, roof collapse. It is the authors' experience that roof collapses related to poor roof drainage are almost exclusively limited to low-slope roofs with parapet walls that prevent drainage over the roof edge. For roofs with parapet walls, the proper function of the primary and secondary drain systems is essential for roof performance and safety. However, many buildings with parapet walls do not have adequate drain systems. The authors consider this to be an "epidemic", akin to the much-publicized deficiencies in public infrastructure. With this study, we propose to discuss common roof drainage issues and to offer a set of conditions for the oversight and approval of roofing projects. For both new construction and existing buildings undergoing roof repairs, compliance with these roof drainage conditions should be mandatory and specifically enforced by the local building officials.

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