Roof Framing Typical Wood Details

3 inch rise per 12 run is a 3 12 pitch roof.

Roof framing typical wood details.

Modern timber roofs are mostly framed with pairs of common rafters or prefabricated wooden trusses fastened together with truss connector plates. Cad details are available in dwg dwf dxf and pdf format. Typical prescriptive roof framing introduction to prescriptive roof framing 3 prescriptive roof construction the international residential code irc and the international building code ibc set out specific guidelines within which conventional light frame wood structures may be built without the need for engineering analysis of each component. Timber framed and historic buildings may be framed with principal rafters or timber roof trusses.

Roofs are basically five types. 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. Roof framing is one of those carpenter skills that appears quite complicated and indeed some roof designs are difficult. Roof pitch the roof pitch is the numerical measure of how steep or shallow a roof is.

The details were adapted from figures in the apa publication the advanced framing construction guide form m400 which highlights construction. An example of each is shown in figure 2 1. Common types of roofs and basic framing terms. Vertical rise over horizontal run.

Grading rules which conform with american soft wood lumber standard ps 20 provide for framing lumber surfaced to standard sizes at the unseasoned condition s grn at 19 percent maximum moisture content s dry and at 15 percent maximum moisture content kd or mc 15. It is the form most commonly used by. To view a cad detail you will need a cad design program or a cad viewer program. Gable a gable roof has a ridge at the center and slopes in two directions.

4 12 through 9 12 are the most common pitches. Another common design in the northeast is the saltbox which is a gable roof with one longer side. 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. When you locate the detail you want just click one of the four file format buttons to download it to your computer.

Shed gable hip gambrel and mansard.