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405.2 Slope

2010 ADA Standards > 4 Accessible Routes > 405 Ramps > 405.2 Slope

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

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
Slope ¹	Maximum Rise
1. A slope steeper than 1:8 is prohibited.
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)

Advisory 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.

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2010 ADA Standards > 4 Accessible Routes > 405 Ramps > 405.2 Slope

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