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Floor Truss Guide

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32' 12' 12' 6" 7'6" Floor trusses are delivered to your site, ready for installation. No cutting or fitting is required. Strong, lightweight and rigid "System 42" Floor Trusses go up easily and quickly. Often without the use of a crane. Expensive steelworkers, welders or riggers are not required. Your crew can do it all. Decking and ceiling materials are attached directly to trusses without need for special hardware. And because System 42 trusses can be spaced wider apart, less trusses are required resulting in less nails to drive. Mechanicals are installed quickly through the open webs without notching or furring. Electricians, A/C contractors and plumbers are off the job quicker. System 42 provides longer clear spans providing exceptional design flexibility. For this reason, plus their cost saving benefits during construction, more and more architects are specifying System 42 Floor Trusses than ever before. FLOOR TRUSSES The Benefits of The Benefits of Floor truss are built with open chases for ductwork and have natural open spaces for plumbing and electrical wiring. Floor truss systems are sometimes called System 42's, because to build them manufacturers turn the 2x4's on their side. This allows for shallow depths as well as a 3 1/2" nailing surface. Some floors are built from 2x3's, others from 2x4's. Floor trusses can be manufactured with many different possible end conditions to accommodate different installation needs; around raised walls, pocketed beams, headers around stairways, etc. Is it OK to move a floor truss? Typical floor trusses are engineered to be spaced evenly, and the truss design drawing verifies the required truss spacing. Occasionally the need will arise to shift one of the floor trusses from where it was designed to be. When this happens, please contact the truss manufacturer to be sure it works. Sliding a floor truss even a few inches puts more load on the truss you're moving it away from, as shown in the drawing below. Check with the truss manufacturer before shifting a truss ! B If you shift it Then overstressed truss carries: : 24" 3" 6.2% more load than designed for 27" on center 6" 12.5% 30" " trusses 9" 18.7% 33" " 16" 3" 9.3% more load than designed for 19" on center 6" 18.7% 22" " Fan Configuration Web Style Two of the most common web patterns for floor trusses: Warren Configuration Web Style 3 www.alpineitw.com

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