? in 12 Design Slope and Water Drainage: Part 1

Construction Science and Engineering, Inc. an architectural and engineering firm, has investigated several low slope roof applications with water stains, ponding, framing damage on the lower side of the roof span, and structural collapse. Further examination typically reveals a relative level surface when compared to other roof locations (Figure 1). A similar occurrence is often found in exterior deck applications (Figure 2). In studying this potentially problematic issue, two building code parameters were identified that contribute to low slope roof and deck serviceability issues. This article examines susceptible bays with respect to the 1/4 in 12 design slope and code permitted deflection ratios. Part 2 will identify design and construction practices that contribute to serviceability issues.

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