According to CBC Chapter 11B (California's accessibility requirements), what is the maximum slope allowed for a pedestrian ramp?
Correct Answer
A) 1:12 (8.33%)
CBC Section 11B-405.2 establishes that pedestrian ramps cannot exceed a slope of 1:12 (8.33%). This California accessibility standard ensures compliance with both federal ADA requirements and California's enhanced accessibility provisions for disabled access in construction projects.
Why This Is the Correct Answer
CBC Section 11B-405.2 sets the maximum ramp slope at 1:12 (8.33%), which means for every 12 horizontal inches of travel, the ramp rises no more than 1 inch. This standard aligns with federal ADA requirements and ensures that wheelchair users and individuals with mobility impairments can navigate ramps safely and without excessive exertion. California's Chapter 11B mirrors ADA requirements but may include additional provisions — the 1:12 max slope is a foundational accessibility standard both nationally and in California.
Why the Other Options Are Wrong
Option B: 1:10 (10%)
1:10 (10%) is steeper than the maximum allowed and would not be compliant under CBC Chapter 11B or ADA. A 10% grade is too steep for safe wheelchair navigation and exceeds the code limit. This option is a common distractor because 1:10 ratios appear in other contexts (like curb ramps in some conditions) but not for standard pedestrian ramps.
Option C: 1:16 (6.25%)
1:16 (6.25%) is actually less steep than the maximum — it would be compliant, but it is not the maximum allowable slope. The question asks for the maximum. Confusing 'maximum allowed' with 'most accessible design' is a typical exam trap. 1:16 is a gentler, preferred slope but not the code ceiling.
Option D: 1:20 (5%)
1:20 (5%) is an even gentler slope, compliant but again not the maximum. A 1:20 slope is recommended where space permits for easier access, but it is far below the maximum of 1:12. Selecting this as the maximum confuses preferred design practice with the code's upper limit.
Memory Technique
1:12 = 'One foot up for every Twelve feet forward.' ADA ramp = 12 is the magic number. Steeper than 1:12 = non-compliant.
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