Alpine

6'3" 4'6" 13' 5 Girder Trusses Girder trusses have two main purposes. The first (Girder Truss A) exists in L, T, H and U shaped buildings to eliminate the need for an interior load-bearing wall. The girder is used to support one end of the intersecting trusses. The trusses are carried on the bottom chord of the girder by hangers. The second use of a girder truss (Girder Truss B) is to support perpendicular framing in hip roofs. In some plans girder truss A and B may be one in the same. The hip framing is carried on both the top and bottom chords of the girder truss by nailing or by hangers. Girder trusses, because of the heavy loads they support, are generally multiple units with larger chord members than the adjacent trusses. Generally, because of the construction of girders, overhangs are not used. The girder truss may also be designed for "drag strut" loads which are calculated and specified by the building designer. Valley Framing Sets Valley framing sets are primarily used to form a ridge line by framing over the main roof where perpendicular building sections intersect. Valley trusses are set directly on the main trusses. Sheathing is required for main trusses with 2x4 top chords, and is recommended for other top chord sizes, under valley frames to continue the lateral bracing of the main truss top chords. The bottom chords of the valley trusses are generally beveled to match the slope of the roof below. Girder Truss A Valley Trusses Standard Truss Flush Cut Truss Valley Frames Sheathing Girder Truss A Valley Trusses Girder Truss A Girder Truss B www.alpineitw.com Framing with Trusses

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