These types of skylights are applicable to conditions where the skylight continues in the same plane as the roof pitch and the ridge of the skylight follows the line of the ridge of the roof. They can also be mounted on curbs on flat roofs with a variety of skylight pitch options and glazed vertical ends.
Both types of skylights can also be attached to adjacent vertical walls at either or both ends. Skylight pitch is generally determined by other architectural conditions or aesthetic requirements.