Residential Wood Roof Framing

Floor beam span tables of residential structural design we will now look at roof rafter and beam design.

Residential wood roof framing. Complete book of framing second edition updated and expanded is a comprehensive guide to rough carpentry and framing written by an expert with over forty years of framing experience. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. This book guides the reader through step by step framing instructions for floors walls roofs door and window openings and stairs. As discussed in chapter 1 the residential construction material most commonly used above grade in the united states is light frame wood.

Therefore this chapter focuses on structural design that specifies standard. Jit applies a unique approach to large scale wood frame projects including multi unit residential facilities and other major commercial projects. 1 8 pitch is given so 24 x 1 8 equals 3 or unit of rise in inches. However before concentrating on roof framing a brief discussion of diaphragms and shear walls is presented because they are two of the key elements in the framing of load bearing wall systems in most residential and light commercial construction.

Line length is the hyptenuse of the triangle whose. The engineering knowledge needed to cost effectively design homes or evaluate residential construction guidelines are lacking in this area. Systemic load path with respect to roof framing connections particularly in the context of conventional wood framed homes. Figure 2 2 roof framing terms.

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. Design of wood framing 5 1 general this chapter addresses elements of above grade structural systems in residential construction. 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. Whether it s new construction or a remodel we ll provide a complete wood framing solution to successfully take your project from concept to completion.

Here we have a wood framed gable roof. The details were adapted from figures in the apa publication the advanced framing construction guide form m400 which highlights construction. This is known as prescriptive. Building framing begins with the roof framing structure.