Here's a selection of relevant articles about top chord from AEC companies and organizations, including Coronis Building Systems, Inc., Vulcraft and Vermont Timber Works, Inc.

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ALA Meeting
1960s b. 1970s c. 1980s d. 2003 Questions 4: With the staggered truss system, the trusses alternate from floor to floor so that the bottom chord of one truss: a. aligns with the top chord of the next truss b. aligns with the front of the building c. aligns with the bottom chord of the next truss Questions 5: In the staggered truss system, columns are located: a. See #1.
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Vulcraft Group - FAQs
...for bottom chord bearing or cantilever joists? 8. Does Vulcraft have recommended moment connection details for joists and joists girders? 9. Are there special requirements for long top chord extensions on K-series joist? 10. Can you design joists for a moving point load at top and /or bottom chords? 11. Why does the diagram for the joist substitutes... See #2.
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STAND UP TO CENTURY’S WORST HURRICANE
Design loads range from 20# to 75# psf. In addition to 18 standard series to select from, special loadings are achieved by adjusting frame spacing. TRUSSFRAME ® top chord – on all series and slopes –is uniformly loaded. A choice of steel or wood purlins may be used. (Wood purlins may be dimension lumber or wood “truss purlins ” furnished locally. See #3.
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Timber Truss | Beautiful Heavy Timber Roof Trusses | Heavy Timber Construction | Manufacturer...
...or more when they are spaced around 12 feet apart. Queen Post Truss Scissor Trusses are a bit more expensive, but give some height in the middle of the room. A common pitch for the top chord is 10 or 12/12, and a bottom chord pitch is often 6/12, so a cathedral ceiling is achieved. Scissor trusses to spread a little when they are loaded. They... See #4.
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Metallic Building Company
Offered in bays of up to 65 feet Bolted end seat attachments to primary framing for quick, safe and verifiable connection Wide flat-top chord surface enables simple, easy and stable clip attachment for standing seam roof applications Reinforced die-formed seats provide stability and strength... See #5.
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Radiant Barrier | Energy Efficiency » 2008 » June
The basic product is a type of aluminum foil ? much enhanced from your typical kitchen foil. This material is stapled to the underside of the top chord of the roof trusses or to the underside of the roof decking so that there will be an airspace below it to the attic floor. The radiant barrier blocks the... See #6.
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