What is the maximum / minimum compatible riser height for the Ladder-Aide?

Minimum step dimensions

  • The minimum recommended rise height is 5.125"
  • The minimum recommended tread depth is 8"

Maximum step dimensions

  • The maximum recommended rise height is 8.25"
  • The maximum recommended tread depth is 11"

What is "riser height" / "rise height" and "tread depth"?

Stair "rise height" is the vertical height or distance between the surface of two stair treads (what you actually step on). You should measure riser heights vertically, between the leading edges of two consecutive steps.

Stair "tread depth" is measured from the front edge of the step to the back of the step being measured. 

The general rule in the United States is a 7" rise and 11" tread depth.