The room under the roof is called an "Attic".
It would be called the "ATTIC".
The room immediately beneath the roof is commonly called the attic.A small dome, lookout, or other structure on a roof is called a cupola.
A Grandstand
I believe you are referring to an area of the roof called a valley. A valley is formed anywhere the downward slope of two roof surfaces meet.
a duplex
The room immediately beneath the roof is commonly called the attic.A small dome, lookout, or other structure on a roof is called a cupola.
The term you might be looking for is Ridge.
Typically, it is the part that extends beyond the building wall, aka tail of the rafter. It creates the area where you can stand under the edge of the roof when it rains.
Under air means the sq. footage under air conditioning through out the house, under roof means everything covered including for example the garage which isnt air conditioned but is a covered sq. foot area.
Another dimension is needed to work out the surface area of the roof.
Menstrual Synchrony