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ICC/ANSI A117.1-2003 Chapter 4.Accessible Routes Table 405.2—Allowable Ramp Dimensions for Construction in Existing Sites, Buildings, and Facilities Slope' 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) 1A slope steeper than 1:8 shall not be permitted. 405.7 Landings.Ramps shall have landings at bot- 405.9 Edge Protection. Edge protection comply- torn and top of each ramp run.Landings shall corn- ing with Section 405.9.1 or 405.9.2 shall be pro- ply with Section 405.7. vided on each side of ramp runs and at each side of ramp landings. 41 . . - • • - ..din•ssha •- - - - _•- • steeper than - • a co - • , - - ': EXCEPTIONS: • . s-rp,T� /4r-iv.- n.)&- v/orn4,vd '1° 1. Ramps not required to have handrails ro ?� where curb ramp flares complying with 405.7.2 Width.Clear width of landings shall be at Section 406.3 are provided. least as wide as the widest ramp run leading to the landing. 2. Sides of ramp landings serving an adjoin- ing ramp run or stairway. 405.7.3 Length. Landings shall have a clear length of 60 inches (1525 mm) minimum. 3. Sides of ramp landings having a vertical drop-off of/z inch(13 mm)maximum within 10 inches(255 mm)horizontally of the mini- 405.7.4 Change in Direction. Ramps that mum landing area. change direction at ramp landings shall be sized to provide a turning space complying with Sec- 405.9.1 Extended Floor Surface.The floor sur- tion 304.3. face of the ramp run or ramp landing shall extend 12 inches (305 mm) minimum beyond the inside 405.7.5 Doorways. Where doorways are adja- face of a railing complying with Section 505. cent to a ramp landing, maneuvering clearances required by Sections 404.2.3 and 404.3.2 shall 405.9.2 Curb or Barrier.A curb or barrier shall be permitted to overlap the landing area.Where be provided that prevents the passage of a 4-inch doors that are subject to locking are adjacent to a (100 mm) diameter sphere where any portion of ramp landing,landings shall be sized to provide a the sphere is within 4 inches (100 mm) of the turning space complying with Section 304.3. floor. 405.8 Handrails. Ramp runs with a rise greater 405.10 Wet Conditions. Landings subject to wet than 6 inches (150 mm) shall have handrails com- conditions shall be designed to prevent the accu- plying with Section 505. mulation of water. 60 min 60 min 60 min i / 1525 1525 1525 l' landing ramp run landing ii ramp run landing F co � at least as wide as ramp run (a) ramp run (b) Fig.405.7 Ramp Landings 23