Roofing Framing Details

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.

Roofing framing details.

In a rafter roof all of these components are required to provide a stable roof. Roof framing can be simple or complex depending on the roof. The rise or height of the roof at its peak is the altitude of the triangle. The rafters carry the applied loads to the exterior walls.

Overhangs hips and dormers add greatly to the complexity of the framing. Needed to tie the roof together where the rafters are framed at an angle to each other. The original roof was built using purlins beams extending between gable ends. And the line length measurement from the roof peak to the building wall is the hypotenuse.

Refer to the details. Stick truss roof framing. Nearly all roofs are framed using one of two methods. Whenever possible begin trim installation at the downwind end of the roof farthest away from the source of prevailing winds to al low flashing laps to face away from wind driven rain.

Include roof pitch roof geometry slope length and climatic factors such as heavy snowfall or rainfall. The run or half the building span is the base of the triangle. Standard stick framing or the newer truss framing. Below is a sketch of the original roof wall structural details for this building.

The roof sheathing consisted of inch thick wide pine boards nailed to the purlins and thick enough to resist much sagging. The framing style of the roof refers to the actual components of each roofing truss and the design of the structural foundation of that roof.