What is the preferred gradient for ADA compliant ramps?

The preferred gradient for ADA compliant ramps is 8.33%. This specification is based on the guidelines outlined in the Americans with Disabilities Act (ADA), which state that for every inch of vertical rise, there should be a corresponding 12 inches (or 1 foot) of ramp run, which translates to a slope ratio of approximately 8.33%. This slope ensures that ramps are accessible and usable for individuals with mobility impairments, providing a balance between accessibility and safety.

Ramps with a steeper gradient can pose difficulties for users, especially those in wheelchairs or using mobility aids, as they require more physical effort to ascend and can increase the risk of slipping or losing control while descending. Therefore, adhering to the recommended gradient of 8.33% helps to promote safe and equitable access in built environments.