Roof Corner Framing

Learn more about off angle roof framing.

Roof corner framing. Explore framing complexities that result when roofs of two different pitches intersect. The inherent strength and integrity of the triangular form makes the roof a sound structure. Shed gable hip gambrel and mansard. Another common design in the northeast is the saltbox which is a gable roof with one longer side.

From gable to mansard read on to learn about the various roof shape types that add character and style to homes. 1 8 pitch is given so 24 x 1 8 equals 3 or unit of rise in inches. Advanced framing also advocates the use of engineered structural lumber such as i joists and glulams as stronger and more reliable alternatives to sawn. Mirrored pairs of rafters meet at a ridge and are connected across the base by a ceiling joist.

Roofs are basically five types. Gabled roofs are the kind young children typically draw. In profile the framing of a conventional pitched roof forms a triangle. Lay your square in the corner of the plywood drawing working from the side of the diagonal line that represents the main roof.

Before the roof sheathing goes on the open framing provides easy access for attaching the return blocking and the nailers for the rake soffit. Line length is the hyptenuse of the triangle whose base equals the total run and whose altitude equals the total rise. Conventional framing requirements however the irc gives no guidance on other aspects of the roof framing such as. A key reason why is that advanced framing for better thermal performance is based on 2x6 frame construction at 19 2 and 24 inches on center rather than 2x4s installed at 16 inches on center.

The roof framing must also function as part of the roof diaphragm to transfer lateral loads to the shear walls below. Figure 2 2 roof framing terms. They have two sloping sides that come together at a ridge creating end walls with a triangular extension called a gable at the top. The last pieces to go in were nailing blocks above the ledger for the back of the return and at the bottom edge of the soffit for attaching the rake 20.

The roof framing must support the roof decking and sheathing and resist loads applied to the sheathing and transfer loads vertically to support walls or frames. A sketchup model helps clarify how various rafters and framing components are assembled in an off angle hip and valley configuration. Bracing design for high end of hip valley rafters bracing design for rafter purlins non symmetrical hip roofs roof diaphragms with plate height changes large roof openings greater than 6 wide. If the unit of rise in inches is 3 then the cut is the unit of rise and the unit of run 12 inches or 3 12.