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(a) Ramps. Curb ramps and ramps to be constructed on existing sites or in existing buildings or facilities may have slopes and rises as shown in Table 2 if space limitations prohibit the use of a 1:12 slope or less.

Table 2 -- Allowable Ramp Dimensions for Construction in Existing Sites, Buildings, and Facilities

Slope* Maximum Rise Maximum Run
Steeper than 1:10 but no steeper than 1:8 3 in (75 mm) 2 ft (0.6 m)
Steeper than 1:12 but no steeper than 1:10 6 in (150 mm) 5 ft (1.5 m)

* A slope steeper than 1:8 not allowed.

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