Ramps in a means of egress have their own geometry under IBC 1012, and it's stricter than people expect. The maximum running slope for an egress ramp is 1:12 (one unit vertical in twelve horizontal), with a maximum rise of 30 inches per run before a level landing is required. Cross slope can't exceed 1:48. Landings are required at the top, bottom, and at direction changes, and ramps rising more than 6 inches or spanning horizontally need handrails on both sides.
Note the code distinguishes egress ramps from accessible ramps, though the geometry overlaps closely with ICC A117.1.
The common mistake is a ramp built steeper than 1:12 to fit a tight space, or a long ramp without the required intermediate landings. Reviewers check the ramp slope, landing spacing, and handrails against 1012 — a too-steep ramp is both an egress and an accessibility failure, so it draws comments from both directions.
This guide describes the model code for general understanding and is not a substitute for the adopted code and amendments enforced by your local authority having jurisdiction. Verify all figures against your jurisdiction's codes of record.