What is the maximum slope ratio allowed for exterior ramps?

The maximum slope ratio allowed for exterior ramps is determined by building codes and accessibility guidelines to ensure safety and usability. A slope ratio of 1 in 10 indicates that for every 10 units of horizontal distance, there can be a rise of 1 unit. This ratio is considered an appropriate balance between accessibility and the physical effort required to ascend or descend the ramp.

In the context of exterior ramps, a 1 in 10 slope is preferable as it provides a manageable incline for individuals using wheelchairs or other mobility aids, ensuring that the ramp is not overly steep. This slope facilitates easier navigation, reducing the likelihood of accidents and enhancing accessibility for all users.

While steeper slopes, such as 1 in 6 and 1 in 8, may be permissible in certain conditions, they can be more challenging for users, especially those with mobility impairments. A ratio of 1 in 12 is often used for longer ramps and may be applicable in situations where space allows, but it is not the maximum slope allowed for exterior ramps in general. Thus, the choice of a 1 in 10 slope is widely recognized as an optimal standard that balances performance and safety.