Roofing Framing Details

The rise or height of the roof at its peak is the altitude of the triangle.

Roofing framing details.

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. The original roof was built using purlins beams extending between gable ends. Needed to tie the roof together where the rafters are framed at an angle to each other. The function of each component is.

The run or half the building span is the base of the triangle. Standard stick framing or the newer truss framing. The roof sheathing consisted of inch thick wide pine boards nailed to the purlins and thick enough to resist much sagging. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.

In a rafter roof all of these components are required to provide a stable roof. Stick truss roof framing. Refer to the details. Overhangs hips and dormers add greatly to the complexity of the framing.

Include roof pitch roof geometry slope length and climatic factors such as heavy snowfall or rainfall. 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. Rafters act more like the top chord of a roof truss than as a roof joist. Below is a sketch of the original roof wall structural details for this building.

Roof framing can be simple or complex depending on the roof. And the line length measurement from the roof peak to the building wall is the hypotenuse.