Quizzes

Test Your Knowledge: Low-Slope Roof Drainage

August 5, 2025

This week’s quiz is from Tapered insulation systems: The art of roof drainage. Proper drainage is critical to the performance and longevity of low-slope roof systems—and the 2021 IBC and IPC provide strict guidelines to follow. Whether you’re designing for new construction or re-roofing an existing building, understanding slope requirements, drainage sizing, and material limitations is essential. Take this short quiz to see how well you know the code and best practices.

Quiz - Aug 5
1. According to the 2021 IBC, what is the minimum design slope required for new low-slope roof construction to ensure proper drainage?
2. In a Kansas City re-roofing project with a total drainage area of 9,393 m² (102,100 sf), if a 102-mm (4-in.) vertical drain leader is selected with a flow rate of 681 lpm (180 gpm), how many drains are required to comply with 2021 IPC rainfall data?
3. What is a key disadvantage of using cellular foam glass insulation in low-slope roof systems, particularly in northern climates?

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