According to ADA requirements, what is the maximum slope allowed for an accessible ramp?
Correct Answer
A) 1:12 (8.33%)
ADA guidelines specify that accessible ramps shall have a maximum slope of 1:12 (8.33%). This ensures that the ramp is usable by individuals with mobility impairments.
Why This Is the Correct Answer
The ADA (Americans with Disabilities Act) Standards for Accessible Design specifically mandates that accessible ramps have a maximum slope of 1:12, which equals 8.33%. This slope provides the optimal balance between accessibility and practicality, ensuring wheelchair users and individuals with mobility devices can safely navigate the ramp. The 1:12 ratio means for every 12 inches of horizontal run, the ramp can rise a maximum of 1 inch vertically. This standard is federally mandated and must be followed in all commercial construction and public accommodations.
Why the Other Options Are Wrong
Option C: 1:20 (5%)
While a 1:16 slope (6.25%) would be more accessible than required, it is not the maximum allowed slope - the ADA permits up to 1:12, making this unnecessarily conservative.
Option D: 1:8 (12.5%)
A 1:8 slope (12.5%) is too steep and exceeds ADA requirements, making it difficult and potentially dangerous for wheelchair users and individuals with mobility impairments to navigate safely.
Memory Technique
Remember 'ADA = 1:12' or think 'one inch up for every foot across' since 12 inches = 1 foot
Reference Hint
Florida Building Code Chapter 11 - Accessibility, or ADA Standards for Accessible Design Section 405.2 (Ramp Running Slope)
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