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Note: This document or portion of document references a state or local code that is stricter than the 2010 ADA Standards requires.

11B-405.2 Slope.

Ramp runs shall have a running slope not steeper than 1:12.

Exception: Reserved. 

[2010 ADA Standards] EXCEPTION: In existing sites, buildings, and facilities, ramps shall be permitted to have running slopes steeper than 1:12 complying with Table 405.2 where such slopes are necessary due to space limitations.

Table 405.2 Maximum Ramp Slope and Rise for Existing Sites, Buildings, and Facilities


Maximum Rise

Steeper than 1:10 but
not steeper than 1:8

3 inches (75 mm)

Steeper than 1:12 but
not steeper than 1:10

6 inches (150 mm)

1. A slope steeper than 1:8 is prohibited. 

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 Advisory 11B-405.2 Slope. To accommodate the widest range of users, provide ramps with the least possible running slope and, wherever possible, accompany ramps with stairs for use by those individuals for whom distance presents a greater barrier than steps, e.g., people with heart disease or limited stamina. 

ETA Editor's Note

Lacking the Exception at 11B-405.2, CBC is more stringent at existing ramps than 2010 ADA Standards.


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