What is referred to as the area underneath the eaves or rafter tails?

The area underneath the eaves or rafter tails is known as the soffit. This component plays a crucial role in both aesthetics and functionality in roofing systems. The soffit helps to cover the exposed underside of the roof's overhang, providing a clean and finished appearance. Additionally, it often has vents that facilitate airflow into the attic space, which is essential for ventilation and moisture management. By allowing air circulation, the soffit contributes to the overall health of the roof structure and prevents issues like mold growth and premature decay of roofing materials.

In contrast, fascia is the board that runs along the lower edge of the roofline, acting as a support for the gutters, while the saddle typically refers to a type of saddle roof or a structure used for drainage purposes. An overhang describes the portion of the roof that extends beyond the walls of the house but does not specifically refer to the area beneath it.