What impact does a low-slope roof have on drainage?

A low-slope roof does not naturally encourage water runoff due to its minimal incline. As such, specific design considerations are essential to effectively manage water runoff. These considerations can include the incorporation of internal drains, scuppers, or pumps to facilitate proper drainage and prevent water accumulation. Standing water can lead to damage such as leaks, mold growth, and structural issues, which makes addressing drainage in low-slope roofs particularly important.

In contrast, a steeper roof would allow water to run off more readily without additional drainage solutions. The presence of underlayment is still necessary in various scenarios for waterproofing, but it is not eliminated solely based on the roof slope. This necessity for proactive drainage management distinctly highlights why design considerations are critical for low-slope roofs.