According to ADA requirements, what is the maximum slope allowed for an accessible ramp?
Correct Answer
B) 1:12 (8.33%)
The ADA requires that accessible ramps have a maximum slope of 1:12, which equals 8.33%. This ensures that ramps are usable by individuals with mobility impairments.
Why This Is the Correct Answer
The ADA Standards for Accessible Design specifically mandate that accessible ramps cannot exceed a slope of 1:12 (8.33%). This ratio means that for every 12 inches of horizontal run, the ramp can rise no more than 1 inch vertically. This maximum slope ensures that individuals using wheelchairs, walkers, or other mobility devices can safely navigate the ramp 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, making it difficult and potentially dangerous for wheelchair users and others with mobility impairments to navigate safely.
Option C: 1:15 (6.67%)
While a 1:15 slope (6.67%) is gentler and would be compliant (being less steep than the maximum), it is not the maximum allowed slope specified by ADA requirements.
Option D: 1:20 (5%)
While a 1:20 slope (5%) is very gentle and would be compliant, it is not the maximum allowed slope and would require significantly more space than necessary to meet ADA requirements.
Memory Technique
Remember '1:12 for ADA' - think 'one inch up for every DOZEN inches forward' or 'ADA = A Dozen Across (12)'
Reference Hint
Florida Building Code, Chapter 11 - Accessibility, or ADA Standards for Accessible Design Section 405.2
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