Manufactured roof trusses differ from stick-framed rafters in that trusses:
Correct Answer
C) Are engineered assemblies whose webs must not be cut on site
Why this is correct: Roof trusses are engineered structural assemblies. Their web members are critical to the design's integrity. Cutting or altering them on-site without engineering approval compromises the structure and is a serious defect. Why the other choices are wrong: "Allow unlimited attic storage space between the lower chords" is false; trusses limit attic space due to the web members. "Use heavier lumber at every chord" is generally false; trusses often use smaller, efficient members. "Are always site-built by carpenters" is false; trusses are typically prefabricated. Exam tip: Field-modified trusses are a red flag. Note any cuts or alterations as a potential structural issue.
Why This Is the Correct Answer
Why this is correct: Roof trusses are engineered structural assemblies. Their web members are critical to the design's integrity. Cutting or altering them on-site without engineering approval compromises the structure and is a serious defect. Why the other choices are wrong: "Allow unlimited attic storage space between the lower chords" is false; trusses limit attic space due to the web members. "Use heavier lumber at every chord" is generally false; trusses often use smaller, efficient members. "Are always site-built by carpenters" is false; trusses are typically prefabricated. Exam tip: Field-modified trusses are a red flag. Note any cuts or alterations as a potential structural issue.
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