A plumber asks to notch a metal-plate-connected wood truss web to clear a vent line. The web is not shown as altered on the truss drawings. What is the proper response?
Correct Answer
B) Do not cut the truss; obtain a repair or alteration detail from the truss designer or engineer
Metal-plate-connected wood trusses are engineered components and should not be field cut, notched, drilled, or altered without an approved repair or alteration detail. Other choices damage the engineered load path.
Why This Is the Correct Answer
Metal-plate-connected wood trusses are engineered components and should not be field cut, notched, drilled, or altered without an approved repair or alteration detail. Other choices damage the engineered load path.
Why the Other Options Are Wrong
Option A: Notch the web if the cut is less than one-third depth
Choice A (Notch the web if the cut is less than one-third depth) is rejected because the choice would not get the project to Do not cut the truss; obtain a repair or alteration detail from the truss designer or engineer, which is the Truss alteration result verified by the source.
Option C: The framing crew should cut the web and sister a 2x4 after inspection
The trap in C is Cut the web and sister a 2x4 after inspection. That selection is wrong because Cut the web and sister a 2x4 after inspection is a different published number than the cited Truss alteration value; BCSI field alteration and repair guidance for metal plate connected wood trusses supports Do not cut the truss; obtain a repair or alteration detail from the truss designer or engineer; Wood trusses are not field altered without truss designer or engineer approval.
Option D: The framing crew should move the metal connector plate with a hammer
Choice D gives Move the metal connector plate with a hammer. Its specific error: it answers the Truss alteration prompt with the wrong practical move.
Memory Technique
Picture a tag on the jobsite; truss alteration is solved by the action that leads to Do not cut the truss; obtain a repair or alteration detail from the truss designer or engineer.
Reference Hint
Open BCSI: Guide to Good Practice for Handling, Installing, Restraining & Bracing of Metal Plate Connected Wood Trusses, 2018/2025; use the index entry or section for "BCSI field alteration and repair guidance for metal plate connected wood trusses" to confirm that Metal-plate-connected wood trusses are engineered components and should not be field cut, notched, drilled, or altered without an approved repair or alteration detail.
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