When installing engineered lumber such as I-joists in California residential construction, what is specifically required by the CRC regarding field modifications?
Correct Answer
B) Only cuts specified in the manufacturer's installation instructions are permitted
CRC Section R502.8.1 requires that engineered lumber products like I-joists be installed according to manufacturer's specifications. Field modifications are only permitted as specifically detailed in the manufacturer's installation instructions, as these products are engineered systems that can fail if improperly modified.
Why This Is the Correct Answer
CRC Section R502.8.1 mandates that engineered lumber products, including I-joists, be installed strictly per manufacturer's installation instructions. I-joists are precision-engineered systems; the flanges carry bending stress and the web carries shear. Any cut or notch not explicitly authorized by the manufacturer can compromise the load path and trigger a catastrophic failure.
Why the Other Options Are Wrong
Option C: Field modifications require approval from a California licensed engineer
The CRC does not require a California-licensed engineer's approval for every field modification of engineered lumber. The code defers to the manufacturer's instructions as the controlling document. Requiring a site engineer for every cut would be impractical and is not the code standard.
Option D: Cuts are permitted only at the ends within 12 inches of supports
Allowing cuts only at the ends within 12 inches of supports is a partial truth that misrepresents the rule. The actual requirement is that only modifications specifically described in the manufacturer's instructions are permitted, which may or may not align with this 12-inch end-zone description depending on the product.
Memory Technique
Engineered lumber = engineered rules. The manufacturer designed it, so the manufacturer's instructions govern it. Think 'factory specs, not field guesses.'
More trade-general-building Questions
When installing engineered lumber joists (I-joists) in California residential construction, what is the primary code requirement for web stiffeners?
What is the required attic ventilation ratio when a vapor retarder is installed on the warm-in-winter side of the ceiling according to the California Residential Code?
In California's Wildland-Urban Interface (WUI) areas, which underlayment requirement applies to Class A fire-rated roof assemblies?
In California, when installing a tankless water heater in a seismic zone, what additional requirement must be met beyond standard installation practices?
According to the California Building Code (CBC), what is the minimum lap splice length for #4 rebar in a concrete foundation wall in normal weight concrete with f'c = 3000 psi?
According to CBC requirements for retaining walls in California, what additional design consideration must be addressed for retaining walls over 4 feet in height located in seismic design categories D, E, and F?
When constructing retaining walls in California that exceed 4 feet in height, which CBC requirement must be met regarding drainage?
Under California regulations, when is a reduced pressure principle (RPP) backflow prevention assembly required for a residential water service connection?
Under California Title 24, what is the minimum electrical service size required for new single-family residential construction?
According to the California Building Code, buildings located in Seismic Design Category D must comply with which specific seismic design requirements?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass
Project Management
60 questions · 70% to pass
Related Study Resources
Previous Question
According to the California Residential Code, what is the maximum horizontal distance allowed between a fixture drain and its trap weir?
Next Question
According to California's Title 24 Energy Code, what is the maximum allowed thermal bridging factor for wood framing in Climate Zone 16 (hot, dry climate) when calculating wall assembly U-factors?