|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.
Advisory 405.7 Landings. Ramps that do not have level landings at changes in direction can create a compound slope that will not meet the requirements of this document. Circular or curved ramps continually change direction. Curvilinear ramps with small radii also can create compound cross slopes and cannot, by their nature, meet the requirements foraccessible routes. A level landing is needed at the accessible door to permit maneuvering and simultaneously door operation.
- Edge protection shall not be required on ramps that are not required to have handrails and have sides complying with 406.3.
- Edge protection shall not be required on the sides of ramp landings serving an adjoining ramp run or stairway.
- Edge protection shall not be required on the sides of ramp landings having a vertical drop-off of 1/2 inch (13 mm) maximum within 10 inches (255 mm) horizontally of the minimum landing area specified in 405.7.
Advisory 405.9.1 Extended Floor or Ground Surface. The extended surface prevents wheelchair casters and crutch tips from slipping off the ramp surface.