What is the ideal maximum slope percentage for buildings and walks?

The ideal maximum slope percentage for buildings and walks is 8.33%, which translates to a 1:12 ratio. This standard is significant for ensuring accessibility, particularly in compliance with the Americans with Disabilities Act (ADA) and other accessibility guidelines. A slope of 8.33% provides a manageable incline that allows people with disabilities to navigate slopes safely, without undue strain or risk of falling.

In addition, this slope is commonly referenced when designing accessible ramps, as steeper slopes can become challenging for individuals using wheelchairs or other mobility aids. Using a maximum of 8.33% ensures that ramps remain functional and safe while maintaining compliance with legal accessibility requirements, making it the best option among the choices given.