Roof Framing Details

Framing a roof is the last step in framing new construction.

Roof framing details.

It is the form most commonly used by the navy. The roof sheathing consisted of inch thick wide pine boards nailed to the purlins and thick enough to resist much sagging. Such methods use a 4 foot design module which governs a 16 inch spacing of joists studs rafters. Like wall studs and floor joists rafters and trusses are spaced every 16 or 24 inches from center to center.

Needed to tie the roof together where the rafters are framed at an angle to each other. The point at which all the raftersare attached to. 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. Common types of roofs and basic framing terms.

Parts of a roof. Gable a gable roof has a ridge at the center and slopes in two directions. The rise or height of the roof at its peak is the altitude of the triangle. And the line length measurement from the roof peak to the building wall is the hypotenuse.

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. The run or half the building span is the base of the triangle. If you plan to have eaves to protect the shed walls make sure you add the extra length when measuring the rafters. Rafters act more like the top chord of a roof truss than as a roof joist.

Wood construction data 1. Define ridge board rafter hip valley sheathing fascia soffit dormer and pitch. Below is a sketch of the original roof wall structural details for this building. The rafters are usually positioned directly above the wall studs.

The rafters carry the applied loads to the exterior walls. 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. The function of each component is. A ridge board is a horizontal member of the roof frame.

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

It is simple in design economical to construct. Transfers the loadof the roof through the raftersto walls below. Details for conventional wood frame construction. Most roofs utilize 16 inch spacings for strength and rigidity.

An example of each is shown in figure 2 1. 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.