Length
Most businesses will need to meet ADA standards for their ramps. ADA requires a 1:12 ratio, which works out to 1 foot of ramp for each inch of rise. For example, a 20 inch rise will require a 20 foot ramp. Additional, ADA limits the longest single span of ramp, prior to a rest or turn platform to 30 feet. Ramps can be as long as needed, but no single run of ramp can exceed 30 feet.
Residential Applications usually will not be required to meet ADA standards (ADA is a commercial code). For Residential use, it is usually recommended not to exceed a 2:12 ratio, which work out to 1 foot of ramp for each 2 inches in rise. For example, a 20 inch rise should apply a 10 foot or longer ramp. The longer the ramp, the more gentle the slope should be, seeing as ramps are focused on maximum ease when travelling.
Read more about this topic: Wheelchair Ramp
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—Henry David Thoreau (1817–1862)
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