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.

Roof framing typical wood details.

It is the form most commonly used by. 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. Roof framing is one of those carpenter skills that appears quite complicated and indeed some roof designs are difficult. An example of each is shown in figure 2 1.

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. Gable a gable roof has a ridge at the center and slopes in two directions. In the u s it is defined by the rise in inches to a 12 run. When you locate the detail you want just click one of the four file format buttons to download it to your computer.

3 inch rise per 12 run is a 3 12 pitch roof. Vertical rise over horizontal run. Shed gable hip gambrel and mansard. Common types of roofs and basic framing terms.

4 12 through 9 12 are the most common pitches. 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. The details were adapted from figures in the apa publication the advanced framing construction guide form m400 which highlights construction. 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. To view a cad detail you will need a cad design program or a cad viewer program. Timber framed and historic buildings may be framed with principal rafters or timber roof trusses. Roofs are basically five types.

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.