The plans show a ramp with a slope indicated as 1:12. What is the maximum allowable slope for an ADA-compliant ramp?
Correct Answer
B) 1:12 (8.33%)
The maximum allowable slope for an ADA-compliant ramp is 1:12 or 8.33%. The ramp shown on the plans meets this requirement exactly.
Why This Is the Correct Answer
The Americans with Disabilities Act (ADA) Standards for Accessible Design specifically requires that ramps have a maximum slope of 1:12, which equals 8.33%. This means for every 1 unit of vertical rise, there must be at least 12 units of horizontal run. The ramp shown on the plans at 1:12 meets this requirement exactly, making it compliant with federal accessibility standards.
Why the Other Options Are Wrong
Option C: 1:20 (5%)
A slope of 1:20 (5%) is actually more accessible than required and would be compliant, but it's not the maximum allowable slope as asked in the question.
Option D: 1:10 (10%)
While 1:10 (10%) is less steep than the maximum allowed, it still exceeds the ADA requirement of 1:12 maximum slope.
Memory Technique
Remember '1:12 for ADA' - think of the 12 disciples, there were exactly 12, just like the maximum ADA ramp ratio is exactly 1:12.
Reference Hint
Florida Building Code Chapter 11 - Accessibility, or ADA Standards for Accessible Design Section 405.2
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