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If steeper slopes than the slopes allowed for new construction are necessitated by space limitations, the slope of ramps in or providing access to existing buildings or facilities shall comply with Table 18-11-1117.3.5.4. A slope steeper than 1:8 is prohibited.
Slope | Maximum Rise |
Steeper than 1:10 but not steeper than 1:8 | 3 inches |
Steeper than 1:12 but not steeper than 1:10 | 6 inches |
For SI: 1 inch = 25.4 mm.