What is the primary purpose of a roof?

The primary purpose of a roof is to protect the inside of the building from weather elements such as rain, snow, wind, and sunlight. It serves as a barrier that prevents water infiltration and keeps the interior spaces dry and comfortable. By providing this essential protection, the roof plays a critical role in preserving the structural integrity of the building and ensuring the safety and comfort of its occupants.

While supporting the rafters and holding the walls together are important functions of a structural system, they are secondary to the roof's primary role in safeguarding the interior from environmental conditions. Additionally, while aesthetic design can enhance the appearance of a building, it does not constitute the fundamental purpose of a roof, which is primarily geared towards functionality and protection.