Ramp ADA
How do you find the length of a ramp?
Example if you have the floor to floor, stair riser heights, ceiling heights.

Hi Brendan!
ADA states that ramps can have a maximum rise of 30 inches before they need a 5foot long landing, and that the maximum slope of a ramp is a ratio 1:12, therefore a length of ramp that rises the full 30 inches allowed will be 30 feet long.
If you have the dimensions of a set of stairs that the ramp is replacing or will be adjacent to, you can calculate the length of the stair based on these rules, the stair riser height, and the number of risers. For example, if you have a staircase with 6 risers at a riser height of 6 inches, the vertical distance from the lower floor to the platform you are ramping up to is 36 inches. Since one 30foot run of ramp can only go up 30 inches, you need to add 5 feet for a landing, then another 6 feet of ramp to rise up the last 6 inches, and you'll end up with a ramp that's 41 feet long. Hope this is helpful!
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