Under Georgia building codes, what is the maximum allowable slope for a wheelchair ramp?
Correct Answer
B) 1:12 (8.33%)
Georgia building code follows ADA requirements for a maximum wheelchair ramp slope of 1:12 or 8.33%.
Why This Is the Correct Answer
Georgia building code adopts ADA accessibility standards, which specify a maximum wheelchair ramp slope of 1:12 (one inch of rise for every 12 inches of run), equivalent to 8.33%. This ratio ensures that wheelchairs and mobility devices can safely navigate the ramp without tipping or requiring excessive effort.
Why the Other Options Are Wrong
Option A: 1:16 (6.25%)
A slope of 1:16 (6.25%) is actually less steep than 1:12 and would be acceptable, but it is not the maximum — it is more gradual than the maximum. The question asks for the maximum allowable slope, which is 1:12, not a more lenient standard.
Option C: 1:8 (12.5%)
A slope of 1:8 (12.5%) is steeper than the ADA maximum of 1:12 and would not be allowed under Georgia building code. A 1:8 slope would be too difficult and potentially dangerous for wheelchair users.
Option D: 1:20 (5%)
A slope of 1:20 (5%) is less steep than 1:12 and would certainly be allowed, but it is not the maximum. Like 1:16, it is a more gradual slope than the code's maximum of 1:12.
Memory Technique
Remember '1:12 = One foot up for every 12 feet forward.' ADA ramps are always 1:12 maximum — think of a clock: 12 is at the top, and that's the maximum number in the ratio denominator.
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