What aspect does the term "grade" influence in roofing design?

The term "grade" significantly influences water drainage and runoff in roofing design. The grade refers to the slope or angle of the roof surface. A properly graded roof allows for effective water drainage, which prevents water from pooling and reduces the risk of leaks and structural damage. When a roof is graded correctly, it directs rainwater toward the gutters and downspouts, ensuring that water is efficiently channeled away from the building. This is crucial for maintaining the integrity of the roofing system and prolonging its lifespan.

While other aspects such as aesthetics, structural integrity, and curb appeal are important in roofing design, they are not directly influenced by the grade in the same way that drainage and runoff are affected. The primary concern with the roof's grade is its ability to manage water flow, making option B the most relevant to this question.