That would be a Gable
The end of a triangular roof is called a gable edge or end.
A roof with only two sloping surfaces and gables at each end is called a gable roof.
A hipped end in roof construction is a roof end plane that is inclined, instead of having a gable end.Some roof designs can have a hip at one end, and a gable at the other end.
The peaks in the roof of a house are called "gable" or "ridge" depending on their specific location. A gable refers to the triangular section formed at the end of a pitched roof, while the ridge is the horizontal line where two sloped roof sections meet at their highest point. These architectural features contribute to the overall design and structural stability of the roof.
it is called a roof
The roof
The roof of the cavity is called the "dorsal surface."
It is what you called the planning for the roof.
Roof
A post that supports a roof is called a column.
The window in a ceiling or roof is called a Skylight.
The roof of a cave is referred to as the "ceiling" or "overhang".