ABA Accessibility Standard for GSA Facilities Pocket Guide
Ramps on accessible routes shall comply with 405.
EXCEPTION: In assembly areas, aisle ramps adjacent to seating and not serving elements required to be on an accessible route shall not be required to comply with 405.
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
|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.
Cross slope of ramp runs shall not be steeper than 1:48.
Floor or ground surfaces of ramp runs shall comply with 302. Changes in level other than the running slope and cross slope are not permitted on ramp runs.
The clear width of a ramp run and, where handrails are provided, the clear width between handrails shall be 36 inches (915 mm) minimum.
EXCEPTION: Within employee work areas, the required clear width of ramps that are a part of common use circulation paths shall be permitted to be decreased by work area equipment provided that the decrease is essential to the function of the work being performed.
The rise for any ramp run shall be 30 inches (760 mm) maximum.
Ramps shall have landings at the top and the bottom of each ramp run. Landings shall comply with 405.7.
Figure 405.7 Ramp Landings
Landings shall comply with 302. Changes in level are not permitted.
EXCEPTION: Slopes not steeper than 1:48 shall be permitted.
The landing clear width shall be at least as wide as the widest ramp run leading to the landing.
The landing clear length shall be 60 inches (1525 mm) long minimum.
Ramps that change direction between runs at landings shall have a clear landing 60 inches (1525 mm) minimum by 60 inches (1525 mm) minimum.
Ramp runs with a rise greater than 6 inches (150 mm) shall have handrails complying with 505.
EXCEPTION: Within employee work areas, handrails shall not be required where ramps that are part of common use circulation paths are designed to permit the installation of handrails complying with 505. Ramps not subject to the exception to 405.5 shall be designed to maintain a 36 inch (915 mm) minimum clear width when handrails are installed.
EXCEPTIONS: 1. Edge protection shall not be required on ramps that are not required to have handrails and have sides complying with 406.3.
2. Edge protection shall not be required on the sides of ramp landings serving an adjoining ramp run or stairway.
3. Edge protection shall not be required on the sides of ramp landings having a vertical drop-off of ½ inch (13 mm) maximum within 10 inches (255 mm) horizontally of the minimum landing area specified in 405.7.
The floor or ground surface of the ramp run or landing shall extend 12 inches (305 mm) minimum beyond the inside face of a handrail complying with 505.
Figure 405.9.1 Extended Floor or Ground Surface Edge Protection
A curb or barrier shall be provided that prevents the passage of a 4 inch (100 mm) diameter sphere, where any portion of the sphere is within 4 inches (100 mm) of the finish floor or ground surface. [ECTCR UFAS 4.8.7]
Figure 405.9.2 Curb or Barrier Edge Protection
Landings subject to wet conditions shall be designed to prevent the accumulation of water.