Issue link: http://alpine.uberflip.com/i/524496
June 2015 | www.wconline.com | 19 Besides the catwalk, Lessei and Cascade truss technician Charles Kies incorporated the project's vaulted and tray ceilings into the truss designs. They also gave special care to engineer trusses that would save money over the course of framing and finishing the job. The catwalk, especially, required precision thinking in order to execute the design properly. "We framed an open, 3-foot-wide area almost 7 feet tall, and it's not triangulated," Kies says. "Un-triangu- lating the truss design threw off the dynamics of the load transfers." Designing the Catwalk Lessei and Kies designed the catwalk to run within the truss profiles above a notched or hat area to house some of the building's mechanical systems. TrusSteel cold-formed steel trusses have a wide f lange, so this feature made for an ideal substrate for the catwalk. Other cold-formed steel truss systems on the market have a much narrower f lange. "It's an unusual design," says Ein- walter. "They raised the bottom chord of the truss at midspan—not the easiest thing to do structurally—but it worked. It was perfect for the HVAC, plumbing and sprinkler pipe." 1'10"8 2'0"13 5'5"2 7'9"1 7'1"4 1"4 1'6" 1'6" 0"13 5'0"7 7'1"4 7'9"1 5'5"2 2'0"13 1'10"8 56'8" 1'10"8 15'3" 7'2"8 3' 12'2"8 15'3" 1'10"8 7'5"15 7'9"1 7'2"8 3'0"13 4'11"3 7'2"8 7'9"1 7'5"15 52'11" 22'5"8 8' 22'5"8 12' 1'10" 10'2" 12' 1'10" 10'2" 8 12 CONSTRUCTION TEAM » General contractor: PDC Midwest, Hartland, Wis. » Structural engineer: Ambrose Engineering, Cedarburg, Wis. » Truss manufacturer: Cascade Mfg Co, Cascade, Iowa » Framing subcontractor: Subur- ban Drywall, Waukesha, Wis. ROOF » Corrugated deck with plywood sheathing and shingles » TrusSteel cold-formed steel- framed trusses with an attic walk- way and notched area to accom- modate mechanical systems A common truss profi le shows the catwalk platform raised above the bottom chord. Web members transfer loads around the rectangular catwalk space. Cascade Mfg. Co. truss designers raised the bottom chord of their corridor trusses to create an area to run HVAC and water lines.