Figure 6-34.-Types of jack rafters.Figure 6-35.-Framing ofRoof Trussesgable dormer with sidewalls.A TRUSS is an engineered structural framethat is used to span distances that are too greatfor single-piece members without intermediatesupports. Figure 6-37 shows a roof truss or raftertruss assembly. Chords and webs are connectedto one another by GUSSET PLATES—metalFigure 6-36.-Cripple jacks.plates or plywood pieces that are nailed, glued,or bolted in place. The load that the roof mustcarry is the important factor to be considered inselecting the type of truss. These loads may con-sist of the roof itself, forces caused by wind, andthe weight of snowfall or ice.Some of the most common types of light woodtrusses are shown in figure 6-38. The W-truss(fig. 6-38, view A) is perhaps the most widelyused. It uses four web members assembled in the6-26
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