1 ❌The ramp slope of more than 5% should not be designed as it will be difficult for people with physical disabilities to move.⠀
✅The optimal slope of the ramp is no more than 5% (about 3°).
2- ❌The slope of the stairs should be no more than 33 °.
✅The optimal staircase slope is 26-33 °
3- ❌The inconvenient size of the steps is less than 280-300 mm in-depth and more than 150-180 mm in height.
✅ To make it convenient to go up and down the stairs, the steps should be 300 mm deep (rise) and 150 mm high.
4- Standard depth range 1000 – 1500 mm.
Optimal dimensions of stair steps in public and residential buildings.

Click Here TWhat Is Dog-Legged Staircase? Advantages, Disadvantage  And Its Design Calculation

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