In addition to moisture, what exposure negatively affects roofs with flatter pitches?

The correct response highlights the significant impact of UV radiation on roofs with flatter pitches. Flatter roofs are more susceptible to direct sunlight exposure, which can lead to the degradation of roofing materials over time. UV radiation accelerates the deterioration process, causing materials to become brittle, lose their reflective qualities, and possibly lead to leaks or other forms of structural compromise. This degradation typically occurs faster in flatter roofs because they do not shed water as effectively as steeper pitched roofs, allowing prolonged exposure to the sun's damaging rays.

While wind pressure, rainfall, and snow accumulation can also adversely affect roofing systems, they are often more critical concerns for steeper roofs or are managed through proper drainage and roofing design in flatter roofs. For instance, wind pressure can cause uplift mostly in corners or edges, rather than affecting vast, flat areas uniformly. Rainfall requires proper drainage solutions, but on flatter pitches, the primary concern is more about accumulated water rather than direct UV exposure. Snow accumulation has its challenges but is often seasonal and can be managed with maintenance. Therefore, UV radiation uniquely contributes to long-term deterioration in a way that is particularly relevant to the sustained exposure experienced by flatter pitches.