Under CBC Chapter 11B (California's accessibility requirements), what is the maximum slope allowed for a pedestrian ramp?
Correct Answer
D) 1:12 (8.33%)
CBC Section 11B-405.2 specifies that ramp slopes shall not exceed 1:12 (8.33%). This California accessibility standard aligns with federal ADA requirements but is enforced through state building codes. Steeper slopes would create barriers for wheelchair users and violate accessibility compliance.
Why This Is the Correct Answer
CBC Section 11B-405.2 specifies that ramp slopes shall not exceed 1:12 (8.33%). This applies to all pedestrian ramps and aligns with the ADA Standards for Accessible Design. A 1:12 ratio is the steepest incline that allows most wheelchair users to safely ascend and descend without assistance.
Why the Other Options Are Wrong
Option A: 1:8 (12.5%)
1:8 (12.5%) is far too steep for a pedestrian ramp under CBC 11B. A 12.5% slope exceeds the code maximum and would be inaccessible to many wheelchair users. This is not a compliant ramp slope under California or federal accessibility standards.
Option B: 1:20 (5%)
1:20 (5%) is a compliant and gentle slope, but it is not the maximum. Choosing 1:20 as the maximum confuses an acceptable slope with the threshold value. The code maximum is 1:12.
Option C: 1:16 (6.25%)
1:16 (6.25%) is more accessible than required but is not the maximum. It could be used in design, but the code-defined ceiling is 1:12. This answer confuses a design choice with the regulatory limit.
Memory Technique
The '12 Rule': every accessibility ramp question in CBC 11B has the same answer — 1:12. Think of a dozen eggs: 12 horizontal units for every 1 vertical unit of rise. Anything steeper than 12-to-1 fails the accessibility test.
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