Under CBC Chapter 11B (California accessibility requirements), what is the maximum slope allowed for a ramp in a path of travel?
Correct Answer
D) 1:12 (8.33%)
CBC Section 11B-405.2 specifies that ramps in a path of travel shall have a maximum running slope of 1:12 (8.33%). This California accessibility standard ensures that ramps are usable by individuals with mobility disabilities while maintaining reasonable construction requirements for compliance with the Americans with Disabilities Act.
Why This Is the Correct Answer
CBC Section 11B-405.2 sets a maximum running slope of 1:12 (8.33%) for ramps in a path of travel. This is the same ratio as the federal ADA standard and is specifically codified in California's building code. A 1:12 ratio means for every 12 inches of horizontal run, the ramp rises no more than 1 inch vertically, ensuring wheelchair users can safely navigate the slope.
Why the Other Options Are Wrong
Option A: 1:16 (6.25%)
1:16 (6.25%) is actually a gentler, more accessible slope than required. While it exceeds the minimum standard, it is not the code maximum — the maximum is 1:12. Confusing 'gentler is safer' with 'what the code mandates as the maximum' is a common error.
Option B: 1:10 (10%)
1:10 (10%) is steeper than the permitted maximum of 1:12 (8.33%). A 10% slope would create a barrier for many wheelchair users and would not comply with CBC Chapter 11B or federal ADA requirements. This option tests whether you can distinguish compliant from non-compliant slopes.
Option C: 1:20 (5%)
1:20 (5%) is an even gentler slope than 1:12 and actually exceeds accessibility requirements. It is not the 'maximum' — the maximum allowable slope is 1:12. This is a distractor that sounds official but does not match the code threshold.
Memory Technique
Think '12 is the limit' — a clock face has 12 hours, and accessibility law gives you 12 inches of run per 1 inch of rise. If the denominator is less than 12 (e.g., 1:10, 1:8), it's too steep. If it's more than 12 (1:16, 1:20), it's gentler but still fine.
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