For each offset angle or change in plate.
Drawing a floor or a roof on a different plane.
A ridgeline marks the apex of each of the three roof sections on this roof plan.
Keep it simple stupid.
Paring these roof types with the appropriate architectural style is recommended for a home to obtain design harmony and curb appeal.
Intricate roofs have many parts that incorporate several of the basic roof designs such as a gable roof sitting atop a gambrel or variations of the gable valley roof design using one or a variety of different types of roof trusses also see our very detailed diagrams showing the different parts of a roof truss.
This means that you have an imaginary plane cutting through the building at an elevation of 4 feet above the floor.
In the two examples shown below the wall plans are identical apart from the parapet wall in roof b yet the two roof shapes are quite different as indicated by the roof lines on the plan drawings.