What is a primary purpose of rain gutters on a roof?

The primary purpose of rain gutters on a roof is to collect and transport rainwater away from the foundation. This is crucial for preventing water accumulation around the base of a structure, which can lead to various issues such as foundation erosion, basement flooding, or mold growth. By channeling the water away from the building, gutters help maintain the integrity of the foundation and protect the overall structure from potential water damage.

While supporting roof shingles, providing ventilation, and adding decorative features may be related to roofing and drainage, they do not align with the main function of gutters. Rain gutters are specifically designed for effective water management, emphasizing their role in safeguarding buildings against water-related problems.