Under 2021 International Residential Code R 802.10.4, which statement about engineered roof-truss alterations is correct?
Correct Answer
C) Cutting or altering truss members requires registered design-professional approval
Under the cited model-code provision, engineered truss members are not cut or otherwise altered without approval of a registered design professional. An appraiser should identify suspected unauthorized modification and obtain appropriate expertise, rather than certify structural safety from appearance. Storage loads also depend on the actual design.
Why This Is the Correct Answer
Option C is correct because engineered truss members are not to be cut, notched, drilled, spliced or otherwise altered without the approval of a registered design professional. An appraiser who sees apparent truss modifications should report them and recommend qualified review.
Why the Other Options Are Wrong
Option A: Attic storage loads are unlimited
Option A says attic storage loads are unlimited. Trusses are designed for specific loads, so storage capacity depends on the actual design rather than being unlimited.
Option B: Each truss chord must use heavier lumber than conventional rafters of the same span and roof load
Option B claims each truss chord must use heavier lumber than conventional rafters of the same span and load. The cited provision addresses alteration approval, not a rule that truss chords exceed rafter sizes; trusses are engineered systems that often use smaller members.
Option D: Trusses must be assembled on site by the framing contractor
Option D says trusses must be assembled on site by the framing contractor. Engineered trusses are commonly fabricated off site, and the cited provision concerns alterations, not who assembles them.
Don't cut the truss
A truss is an engineered team; altering one member requires an engineer's approval.
How to use: Use this when a question asks about modifying, notching or cutting roof trusses.
Exam Tip
For engineered components, favor answers requiring qualified design approval for alterations over answers claiming unlimited capacity or fixed construction methods.
Common Mistakes to Avoid
- -Assuming attic space over trusses can hold unlimited storage
- -Believing a contractor may alter truss members without design approval
- -Certifying structural safety from visual appearance alone
Concept Deep Dive
Analysis
This question tests knowledge of the model-code rule on altering engineered roof trusses. Because trusses are designed as engineered systems, cutting or altering their members requires approval of a registered design professional.
Background Knowledge
Engineered trusses rely on each member and connection working together to carry loads. Unauthorized cuts or alterations can compromise structural capacity, so model codes require a registered design professional's approval, and appraisers refer suspected modifications to qualified experts rather than certifying safety.
Real-World Application
While viewing an attic, an appraiser notices that several truss webs were cut to create storage space. The appraiser reports the apparent modification and recommends evaluation by a qualified professional rather than judging the roof structurally sound.
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