What is the maximum running slope allowed for ramps used as part of a means of egress?

The maximum running slope allowed for ramps used as part of a means of egress is 1:12. This ratio indicates that for every inch of vertical rise, there should be at least 12 inches of horizontal run. This standard is set to ensure that ramps are accessible and safe for all users, including those with mobility impairments. A 1:12 slope strikes a balance between being manageable for individuals using wheelchairs or other mobility devices while still allowing for the effective egress from a building in case of an emergency.

The need for stringent requirements like the 1:12 ratio is emphasized by safety guidelines established in various building codes, such as the Americans with Disabilities Act (ADA) in the United States. Ramps with a slope greater than 1:12 can become too steep, posing risks for users who may have difficulty navigating steeper inclines, leading to potential accidents during evacuation situations.

In contrast, the other ratios present higher slopes, which would not meet the accessibility and safety requirements for egress ramps, causing difficulties for users in navigating these ramps effectively.