Under CBC Chapter 11B (California's accessibility requirements), what is the maximum slope allowed for a ramp in new construction?
Correct Answer
C) 1:12 (8.33%)
CBC Section 11B-405.2 establishes a maximum ramp slope of 1:12 (8.33%) for new construction. This California accessibility standard ensures safe navigation for individuals using wheelchairs and mobility devices, providing a reasonable grade while maintaining accessibility compliance throughout the state.
Why This Is the Correct Answer
CBC Section 11B-405.2 establishes a maximum ramp slope of 1:12 (8.33%) for new construction. This mirrors the federal ADA Standards for Accessible Design and ensures that ramps are navigable for wheelchair users without excessive effort. The 1:12 ratio is the nationally recognized accessibility standard and is explicitly codified in California's Chapter 11B.
Why the Other Options Are Wrong
Option A: 1:16 (6.25%)
1:16 (6.25%) is a gentler slope than 1:12, meaning it is more accessible but not the code maximum. The question asks for the maximum allowed slope. Choosing a gentler slope confuses 'what is allowed' with 'what is required as the upper limit.'
Option B: 1:20 (5%)
1:20 (5%) is even gentler than 1:16 and well within compliance, but it is not the maximum permissible slope. It would be used where space allows a very gradual approach, but the code maximum is 1:12.
Option D: 1:10 (10%)
1:10 (10%) exceeds the maximum slope allowed by CBC 11B and the ADA. A ramp at 1:10 is too steep for most wheelchair users and would be a code violation. This is the 'trap' answer for candidates who confuse the ratio direction.
Memory Technique
Memorize: RAMP MAX = 1:12. Twelve inches of horizontal run per one inch of rise. The ADA uses 1:12, and so does California's Chapter 11B. When in doubt, 1:12 is the universal ramp accessibility standard.
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