What is the maximum allowable slope for ramps in a means of egress?

The maximum allowable slope for ramps in a means of egress is 1:12, which means for every inch of vertical rise, there should be at least 12 inches of horizontal run. This standard is important for ensuring accessibility and safety, particularly for individuals who may be using wheelchairs or other mobility aids. A 1:12 slope provides a manageable gradient that enables users to ascend or descend without excessive effort, mitigating the risk of falls or fatigue.

In contexts such as the Americans with Disabilities Act (ADA) guidelines, the 1:12 ratio is specifically identified as the maximum slope for wheelchair ramps that do not require additional safety features. This makes the ramp accessible for a wider range of users, ensuring that means of egress are compliant with regulations that aim to promote equality in access to buildings and facilities. Other slopes like 1:16, 1:20, and 1:24 may be appropriate for different situations or uses, but they do not represent the maximum allowed slope in this particular context.