In California seismic design categories D1, D2, and E, what is the maximum spacing allowed for anchor bolts in wood sill plates according to CBC requirements?
Correct Answer
D) 6 feet on center maximum
CBC Section 2308.3.3 requires anchor bolts in wood sill plates to be spaced no more than 6 feet on center in seismic design categories D1, D2, and E, which covers most of California. This spacing is more restrictive than lower seismic zones to provide adequate connection between the foundation and wood frame structure.
Why This Is the Correct Answer
CBC Section 2308.3.3 specifies 6 feet on center as the maximum anchor bolt spacing in wood sill plates for Seismic Design Categories D1, D2, and E — the zones that cover most of California. This consistent standard applies across both general (2308.6.1) and high-seismic (2308.3.3) provisions, ensuring an adequate foundation-to-frame connection everywhere in the state.
Why the Other Options Are Wrong
Option A: 4 feet on center maximum
4 feet on center is more restrictive than the code requirement and is not the stated maximum for SDC D or E. While closer spacing may be used in engineered designs, it is not the standard code maximum.
Option B: 10 feet on center maximum
10 feet on center greatly exceeds the allowed maximum. Sill plates anchored this loosely would be unable to resist lateral seismic forces, especially in California's highest seismic zones.
Option C: 8 feet on center maximum
8 feet on center also exceeds the code limit. This would leave unacceptably long spans of sill plate without positive anchorage, violating CBC requirements for high-seismic SDC zones.
Memory Technique
SDC D1, D2, E — three seismic categories, one rule: 6 feet maximum. The '6' in '6 feet' echoes the seismic 'sixes' (D1+D2+E = 3 zones, 2 'D's, 1 'E' = still 6 feet). Consistency is the takeaway.
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
Under California Title 24, what is the minimum electrical service size required for new single-family residential construction?
Next Question
When installing roof ventilation in California, what is the standard net free ventilation area ratio required when both intake and exhaust vents are provided?