Final answer:
The lower part of the roof which includes the soffit and fascia is called the eave. The soffit is the exposed surface under the roof's overhang, while the fascia is the vertical edge connected to the rafters or trusses.
Step-by-step explanation:
The lower part of the roof, which includes the soffit and fascia, is commonly referred to as the eave.
The soffit is the exposed surface beneath the overhanging section of a roof eave and can be used for ventilation in the attic space. The fascia is the vertical finishing edge connected to the ends of the rafters, trusses, or the area where the gutter is attached to the roof. Together, they not only add aesthetic value but also provide protection by sealing off the roof and preventing water and pests from entering. The eave serves a critical function in the design and maintenance of a house.