Under the California Building Code Chapter 11B (accessibility requirements), what is the maximum slope allowed for a pedestrian ramp?
Correct Answer
A) 1:20 (5%)
CBC Chapter 11B Section 1133B.5.1 establishes a maximum slope of 1:20 (5%) for pedestrian ramps, which is more restrictive than federal ADA requirements. This California-specific standard provides enhanced accessibility by requiring gentler slopes, making ramps easier and safer for individuals with mobility impairments to navigate.
Why This Is the Correct Answer
CBC Chapter 11B Section 1133B.5.1 (and the updated Section 11B-405.2) mandates a maximum ramp slope of 1:20 (5%). This is stricter than the federal ADA standard of 1:12 (8.33%). California's enhanced requirement reflects the state's commitment to superior accessibility, making ramps easier to navigate for wheelchair users and individuals with limited mobility.
Why the Other Options Are Wrong
Option B: 1:15 (6.67%)
1:15 (6.67%) is between the California and federal standards. While more restrictive than ADA, it does not match the actual CBC Chapter 11B requirement of 1:20 (5%) and would be a code violation in California new construction.
Option C: 1:12 (8.33%)
1:12 (8.33%) is the federal ADA standard — not the California standard. California's CBC is more restrictive than federal ADA. This is a classic trap on California-specific exams: knowing when California goes beyond federal minimums.
Option D: 1:10 (10%)
1:10 (10%) exceeds even the federal ADA maximum slope and would be a clear violation of both California and federal accessibility requirements. No standard permits such a steep accessible ramp.
Memory Technique
Remember: California goes the EXTRA MILE for accessibility. While federal ADA says 1:12, California says 1:20 — a gentler, longer ramp. '20' > '12' means a flatter slope and greater access.
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