A roof truss manufacturer specifies that trusses can only be lifted at designated lift points. The general contractor's crew wants to lift them at the peak for convenience. What should be done?
Correct Answer
B) Follow the manufacturer's lifting instructions exactly
Manufacturer specifications must be followed exactly as they are based on engineering calculations for that specific truss design. Deviating from lift points can cause structural damage or failure.
Why This Is the Correct Answer
Manufacturer specifications for truss lifting points are based on precise engineering calculations that account for the truss design, load distribution, and structural integrity. These lift points are strategically located to prevent bending, twisting, or failure of the truss members during handling. Deviating from these specifications can cause immediate structural damage, void warranties, and create safety hazards. Following manufacturer instructions exactly is also a legal requirement under building codes and OSHA regulations.
Why the Other Options Are Wrong
Option A: Allow lifting at the peak since it's the strongest point
The peak is actually one of the weakest points for lifting because it concentrates all the weight on the top chord connections and can cause the truss to bend or buckle. The peak was not designed to handle the entire weight of the truss as a lifting point.
Option C: Lift at quarter points for better balance
Quarter points are not necessarily the correct lifting locations unless specifically designated by the manufacturer. Using arbitrary lifting points, even if they seem logical, can still cause structural damage if they weren't engineered for that purpose.
Option D: Use additional workers to support the truss during lifting
While additional workers might provide extra support, this doesn't address the fundamental issue of using incorrect lifting points. The structural stress and potential damage from improper lift points cannot be prevented simply by adding more workers.
Memory Technique
Think 'MFG = Must Follow Guidelines' - Manufacturer specifications are non-negotiable engineering requirements, not suggestions.
Reference Hint
Florida Building Code, Chapter 23 - Wood; OSHA 1926 Subpart R - Steel Erection (lifting procedures); Truss manufacturer installation guides
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