What is the maximum slope for ramps in terms of vertical units to horizontal units?

The maximum slope for ramps, especially when considering guidelines like those from the Americans with Disabilities Act (ADA), is established to ensure accessibility for individuals with disabilities. The correct ratio of 1:12 means for every inch of vertical rise, there should be at least 12 inches of horizontal run. This configuration creates a slope that is manageable for wheelchair users and others with mobility challenges.

In practical terms, a slope of 1:12 offers a gentle incline, reducing the effort required to ascend or descend while also minimizing the risk of accidents. This standard is widely recognized in both commercial and residential settings to promote universal design and accessibility.

Other ratios, such as 1:10 or 1:8, would lead to steeper inclines, making ramps more difficult to navigate safely for those with physical limitations. A 1:14 slope would be easier to navigate but is beyond the standard prescribed for accessibility in most guidelines. The 1:12 ratio strikes a balance between safety and practicality, making it the preferred standard in construction and design for ramps.