For ADA compliance on construction sites in California, what is the maximum allowable slope for accessible routes during construction?
Correct Answer
A) 8.33% (1:12)
Under the California Building Code Chapter 11A (California's accessibility standards), accessible routes must not exceed 8.33% (1:12) slope. This applies to temporary accessible routes during construction to ensure continued accessibility compliance throughout the construction process.
Why This Is the Correct Answer
The ADA and California Building Code Chapter 11A specify a maximum slope of 8.33% (a 1:12 ratio, meaning 1 inch of rise for every 12 inches of run) for accessible routes. This applies to temporary accessible routes during construction as well as permanent ones, ensuring individuals with disabilities can safely navigate construction site access routes.
Why the Other Options Are Wrong
Option B: 5% (1:20)
5% (1:20) is the maximum cross-slope allowed for accessible walking surfaces and is also a common slope for accessible routes where ramps are not intended. It is less steep than the 8.33% maximum ramp slope. Selecting 5% confuses cross-slope limits with the maximum ramp slope.
Option C: 10% (1:10)
10% (1:10) exceeds the maximum allowable slope for accessible routes. A 10% grade would be too steep for wheelchair users and is not compliant with ADA or California accessibility standards.
Option D: 12% (1:8.33)
12% (1:8.33) inverts the correct ratio. The correct answer is 1:12 (8.33%), not 1:8.33 (12%). This distractor is designed to catch candidates who remember the ratio but invert the numbers.
Memory Technique
ADA ramp = 1:12. Think of it as '1 inch up for every foot forward.' One foot = 12 inches, so 1 inch of rise per 12 inches of run. As a percentage: 1 ÷ 12 = 0.0833 = 8.33%. Never confuse the ratio denominator (12) with the slope percentage (8.33%).
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