What is the maximum slope allowed for an accessible ramp according to ADA guidelines?
Correct Answer
A) 1:12 (8.33%)
ADA guidelines specify a maximum slope of 1:12 (8.33%) for accessible ramps. This means for every 12 inches of horizontal run, the ramp can rise no more than 1 inch.
Why This Is the Correct Answer
The ADA (Americans with Disabilities Act) specifically mandates that accessible ramps must not exceed a slope of 1:12, which equals 8.33%. This ratio means that for every 12 inches of horizontal distance, the ramp can rise a maximum of 1 inch vertically. This slope provides the optimal balance between accessibility for wheelchair users and space efficiency. The 1:12 ratio is a fundamental ADA requirement that contractors must follow for all accessible ramp construction.
Why the Other Options Are Wrong
Option B: 1:15 (6.67%)
While 1:15 (6.67%) is gentler and would be acceptable, it is not the maximum allowed slope - ADA permits up to 1:12, making this unnecessarily restrictive.
Option D: 1:20 (5%)
A 1:10 slope (10%) is too steep and exceeds ADA requirements, making it difficult and potentially dangerous for wheelchair users to navigate safely.
Memory Technique
Think 'ADA = A Dozen Apart' - the 12 in 1:12 represents a dozen, making it easy to remember the maximum slope ratio.
Reference Hint
Florida Building Code Chapter 11 - Accessibility, or ADA Standards for Accessible Design Section 405.2
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