(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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