R407 — Ramps

R407.1 General. Ramps shall comply with R407. R407 does not apply to curb ramps or pedestrian access routes following the grade established for the adjacent street consistent with the requirements of R302.4.1. R407.2 Running Slope. The running slope of each ramp run shall be 1:12 (8.3%) maximum. R407.3 Cross Slope. The cross slope of ramp runs shall be 1:48 (2.1%) maximum. R407.4 Clear Width. The clear width of a ramp run shall be 48 inches (1220 mm) minimum. Where handrails are provided, the clear width between handrails shall be 48 inches (1220 mm) minimum. Exception: Where a ramp only serves a building entrance, the clear width of the ramp run shall be permitted to be 36 inches (915 mm) minimum. Where handrails are provided, the clear width between handrails shall be permitted to be 36 inches (915 mm) minimum. R407.5 Rise. The rise for any ramp run shall be 30 inches (760 mm) maximum. R407.6 Landings. Ramps shall have landings at the top and the bottom of each ramp run. Landings shall comply with R407.6. R407.6.1 Slope. Landing slopes shall be 1:48 (2.1%) maximum parallel and perpendicular to the ramp running slope. R407.6.2 Width. The landing clear width shall be at least as wide as the widest ramp run leading to the landing. R407.6.3 Length. The landing clear length shall be 60 inches (1525 mm) long minimum. R407.6.4 Change in Direction. Ramps that change direction between runs at landings shall have a clear landing 60 inches (1525 mm) minimum by 60 inches (1525 mm) minimum. R407.7 Surfaces. Surfaces of ramp runs and landings shall comply with R302.6, except that changes in level are not permitted. R407.8 Handrails. Ramp runs with a rise greater than 6 inches (150 mm) shall have handrails complying with R409. R407.9 Edge Protection. Edge protection complying with R407.9.1 or R407.9.2 shall be provided on each side of ramp runs and each side of ramp landings except those serving an adjoining ramp run, stairway, or other pedestrian circulation path. R407.9.1 Extended Ramp Surface. The surface of the ramp run or landing shall extend 12 inches (305 mm) minimum beyond the inside face of a handrail complying with R409. R407.9.2 Curb or Barrier. A curb that is 4 inches (100 mm) high minimum, or a barrier 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 surface of the ramp run or landing, shall be provided.