What type of soffit is attached directly to the underside of rafter tails?

The type of soffit that is attached directly to the underside of rafter tails is known as enclosed soffit. This design typically occurs in situations where the rafter tails are exposed to the exterior and are directly covered by a flat surface which is often made from materials such as wood, vinyl, or metal. Enclosed soffits serve both functional and aesthetic purposes; they provide protection against pest infestations and moisture accumulation while finishing off the roofline for a cleaner look.

Open soffits, on the other hand, have openings that allow for ventilation, typically found in areas where airflow is necessary for roof ventilation. Closed soffits provide a sealed connection, but are often used in construction where there isn't direct exposure of rafter tails. Exposed soffits refer to those rafter tails that remain visible and without any covering, leaving the structural components exposed.