According to ADA requirements, what is the maximum slope allowed for an accessible ramp?
Correct Answer
B) 1:12 (8.33%)
ADA requires accessible ramps to have a maximum slope of 1:12, which equals 8.33%. This ensures wheelchair accessibility while maintaining safety.
Why This Is the Correct Answer
The ADA Standards for Accessible Design specifically require that accessible ramps have a maximum slope of 1:12 (8.33%). This means for every 12 inches of horizontal run, the ramp can rise a maximum of 1 inch. This slope provides the optimal balance between accessibility for wheelchair users and safety, ensuring that individuals can navigate the ramp independently without excessive strain or risk of losing control.
Why the Other Options Are Wrong
Option A: 1:10 (10%)
A 1:10 slope (10%) is too steep and exceeds ADA requirements. This slope would be difficult and potentially dangerous for wheelchair users to navigate safely.
Option C: 1:15 (6.67%)
While a 1:15 slope (6.67%) is gentler and would be acceptable under ADA guidelines, it is not the maximum allowed slope. The question asks for the maximum slope, which is 1:12.
Option D: 1:20 (5%)
A 1:20 slope (5%) is much gentler than required and while acceptable, it is not the maximum allowed slope. This would require significantly more space and is not the standard maximum.
Memory Technique
Remember 'ADA = 1:12' - think 'A Dozen' (12) for ADA ramps, or '12 disciples, 1 ramp rule'
Reference Hint
Look up ADA Standards for Accessible Design, Chapter 4 - Accessible Routes, Section 405 Ramps, or Florida Building Code Chapter 11 - Accessibility
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