Residential Wood Roof Framing

This book guides the reader through step by step framing instructions for floors walls roofs door and window openings and stairs.

Residential wood roof framing.

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. Jit applies a unique approach to large scale wood frame projects including multi unit residential facilities and other major commercial projects. Building framing begins with the roof framing structure. This is known as prescriptive.

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 details were adapted from figures in the apa publication the advanced framing construction guide form m400 which highlights construction. Here we have a wood framed gable roof. 1 8 pitch is given so 24 x 1 8 equals 3 or unit of rise in inches.

Figure 2 2 roof framing terms. 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. Line length is the hyptenuse of the triangle whose. Design of wood framing 5 1 general this chapter addresses elements of above grade structural systems in residential construction.

Therefore this chapter focuses on structural design that specifies standard. The engineering knowledge needed to cost effectively design homes or evaluate residential construction guidelines are lacking in this area. 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. Floor beam span tables of residential structural design we will now look at roof rafter and beam design.

The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. Let s consider a basic gable wood roof framing design. Systemic load path with respect to roof framing connections particularly in the context of conventional wood framed homes. 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.