use the 17" on your rafter square
A hip roof, or hipped roof, is a type of roof where all sides slope downwards to the walls, usually with a fairly gentle slope. A square hip roof is shaped like a pyramid. Hip roofs on rectangular houses will have two triangular sides and two trapezoidal ones. A hip roof on a rectangular plan has four faces.
For a gable end to gable end installation on 16" spacing you would need 34 trusses, 2 of which would be the gables. If your roof-line has hip ends or will be incorporated into an existing structure there will be more trusses.
Usually the best way is to simply build a new sloped roof onto the flat roof.
8’
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 end of a roof when it is formed into a shape intermediate between a gable and a hip; the gable rises about halfway to the ridge, resulting in a truncated shape, the roof being inclined backward from this level.
GAMBREL
If the gable is formed by the two slopes and a horizontal line, it is called a gable roof.
because it has like two conjoined roofs acting like one thus reflecting a hip like shape.
That would be a Gable
The top of a gable form roof is the peak. This is the tip of the gable and running back along along the rest of the roof it forms the high point of the whole roof which is called the ridgeline. Some gable roofs have a finial, or decorative spike, at the peak of the 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.
The gable roof, also called a saddle roof, has two planes. To measure, multiply the length times the width of each plane, then add together.
A hipped roof is a roof that slopes downwards. It has a uniform angle of pitch. To learn more about how to build a hipped roof, one can visit the wikiHow website.
Hipped roof is appropriate or extreme weather for it goes against the strong winds and hurricanes. One disadvantage of this roof is its difficult maintenance because of a limited amount of roof space.