Roof Framing Details

The original roof was built using purlins beams extending between gable ends.

Roof framing details.

A ridge board is a horizontal member of the roof frame. The run or half the building span is the base of the triangle. Such methods use a 4 foot design module which governs a 16 inch spacing of joists studs rafters. Skillion shed style roof framing the skillion and shed style roofs are framed with a single slope 2 4 or 2 6 or thicker rafters spanning from the low wall to the high wall.

Transfers the loadof the roof through the raftersto walls below. In a rafter roof all of these components are required to provide a stable roof. The point at which all the raftersare attached to. The function of each component is.

Like wall studs and floor joists rafters and trusses are spaced every 16 or 24 inches from center to center. A 2 nominal lumber thickness provides the maximum pullout values for both screws and nails when the fasteners penetrate a minimum of 1 into the wood. Needed to tie the roof together where the rafters are framed at an angle to each other. The first approach to achieving a strong durable struc ture involving economical use of materials is to follow a basic modular plan for layout and attachment of framing members.

And the line length measurement from the roof peak to the building wall is the hypotenuse. Most roofs utilize 16 inch spacings for strength and rigidity. The rise or height of the roof at its peak is the altitude of the triangle. Types of roofs the most commonly used types of pitched roof construction are the gable the hip the intersecting and the shed or lean to.

While most home builders will outsource the construction of roofing trusses the rafter supports of the roof itself learning to frame a roof yourself is one of the true arts of carpentry and a basic primer is covered below. Common types of roofs and basic framing terms. Below is a sketch of the original roof wall structural details for this building. Stick framing combines roof rafters with ceiling joists.

The roof sheathing consisted of inch thick wide pine boards nailed to the purlins and thick enough to resist much sagging. Gable a gable roof has a ridge at the center and slopes in two directions. The substructure to which the metal panels are fastened must be properly spaced and sufficiently thick to provide a roof or wall system able to meet required design loads. Define ridge board rafter hip valley sheathing fascia soffit dormer and pitch.

If you plan to have eaves to protect the shed walls make sure you add the extra length when measuring the rafters. An example of each is shown in figure 2 1. Details for conventional wood frame construction. Rafters act more like the top chord of a roof truss than as a roof joist.

Label and identify the parts of a. Parts of a roof. Framing a roof is the last step in framing new construction. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.

The rafters are usually positioned directly above the wall studs. The rafters carry the applied loads to the exterior walls.