Accessibility · Ramps
Ramp Running Slope
Maximum running slope for an accessible ramp, expressed as a rise-to-run ratio.
Description
A 1:12 maximum slope (rise:run) is the standard accessible ramp maximum, meaning 1 in of rise for every 12 in of horizontal run. Gentler slopes are preferred wherever space allows, and cross slope (perpendicular to travel) must be much flatter.
Notes
- Maximum rise for any single ramp run is typically 760 mm (30 in) before a landing is required.
Sources
- ADA Standards for Accessible Design
- ICC A117.1
Tags
Values
Maximum running slopeMaximum
1:12 (8.3%)1:12 (8.3%)
Preferred running slopeRecommended
1:16–1:201:16–1:20
Maximum cross slopeMaximum
1:48 (2%)1:48 (2%)