What is the primary function of a rafter in roofing?

The primary function of a rafter in roofing is to support the roof structure. Rafters are inclined structural members that form the framework of the roof, spanning from the ridge or peak down to the eaves. They bear the weight of the roof covering and any additional load, such as snow, rainfall, or even the weight of roofing materials. This load-bearing capability is crucial for maintaining the integrity of the entire roofing system, ensuring that it remains stable and secure.

In the context of roofing construction, while insulation, shingles, and ventilation are important aspects of a roofing system, they do not fall under the primary role of rafters. Insulation is typically added between rafters to enhance energy efficiency, shingles are the outer layer that protect the roof, and ventilation involves design elements to improve airflow and moisture control within the roof space. Rafters are fundamentally about structural support, which is why they are critical to the overall performance and durability of the roofing system.