Roof Framing Typical Wood Details

Chapter 7 ceiling and roof framing 40 ceiling joists 40 flush ceiling framing 42 post and beam framing 42 roof slopes 44 flat roofs 45 pitched roofs 45 valleys 48 dormers 48 overhangs 48 ridge beam roof details 49 lightweight wood roof trusses 49 chapter 8 wall sheathing 53 types of sheathing 53 corner bracing 54.

Roof framing typical wood details. In the u s it is defined by the rise in inches to a 12 run. Roof pitch the roof pitch is the numerical measure of how steep or shallow a roof is. Cad details are available in dwg dwf dxf and pdf format. 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.

It is the form most commonly used by. Shed gable hip gambrel and mansard. Vertical rise over horizontal run. Modern timber roofs are mostly framed with pairs of common rafters or prefabricated wooden trusses fastened together with truss connector plates.

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. An example of each is shown in figure 2 1. Common types of roofs and basic framing terms. 3 inch rise per 12 run is a 3 12 pitch roof.

Gable a gable roof has a ridge at the center and slopes in two directions. Roof framing is one of those carpenter skills that appears quite complicated and indeed some roof designs are difficult. 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. 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. To view a cad detail you will need a cad design program or a cad viewer program. 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. 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.

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