Under Nevada building codes, what is the maximum allowable slope for a wheelchair ramp in commercial construction?
Correct Answer
B) 1:12 (8.33%)
Nevada follows ADA requirements with a maximum slope of 1:12 (8.33%) for wheelchair ramps in commercial construction.
Why This Is the Correct Answer
The ADA Standards for Accessible Design, adopted by Nevada, set the maximum running slope for a wheelchair ramp at 1:12, meaning one inch of rise for every 12 inches of horizontal run, which equals 8.33%. This is the universal standard that balances safe self-propulsion with practical construction.
Why the Other Options Are Wrong
Option A: 1:16 (6.25%)
1:16 (6.25%) is a gentler slope than required. While gentler is safer, this is NOT the maximum allowable — it is more conservative than code demands. The question asks for the maximum, which is 1:12.
Option C: 1:20 (5%)
1:20 (5%) is the maximum slope for accessible routes (walking surfaces), not ramps. Confusing accessible route slope limits with ramp slope limits is a common error.
Option D: 1:8 (12.5%)
1:8 (12.5%) is steeper than the ADA maximum and would be code-violating. Ramps steeper than 1:12 are not permitted under ADA/Nevada commercial standards.
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