The rise or height of the roof at its peak is the altitude of the triangle.
Stick framed roof diagram.
Stick truss roof framing.
The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.
From one end of the rafter material using a speed square or framing square mark an x in 12 angle on the rafter and cut it measure down y height from the long point of the rafter cut and make a mark.
A horizontal timber or metal resting at the peak of the roof the rafters and trusses are connected to the ridge board for a cohesive framework.
This roof has horizontal battens for tile or metal.
The run or half the building span is the base of the triangle.
This will the first point of the rafter measurement line using the results of your rafter length calculation measure from this point along the rafter measurement.
You then have rafters running down from this ridge board and resting on the top wall plates.
Overhangs hips and dormers add greatly to the complexity of the framing.
A stick framed roof uses 2x4 s or 2x6 s or whatever you are framing with but has a ridge board running down the middle ridge line.
However constructing a stick framed roof is not always easy.
This roof framing diagram illustrates how a hip roof is built.
And the line length measurement from the roof peak to the building wall is the hypotenuse.
Roof framing rafter layout.
Sometimes the rafter will have a tail and extend out past the wall so that you have a soffit or overhang.
A composite decking made of solid materials it resembles real wood and particularly strong and stable for bearing heavy load.
It is a waterproofing layer made of regular felt stacked above the solid.
Standard stick framing or the newer truss framing.