I would like to build stairs down from a rock but don't really understand how to determine how many steps are needed. I'm also unsure how to align all the anchors so that the stairs have a 31-degree angle.

1. See my quickly sketched drawing where brown is the rock and black is the stairs. How do I find out the height h to calculate the amount of timber and the steps for height level?

2. How do I determine L (the length) to know how much timber and the number of steps needed for the length?

3. How do you establish a string line on rock? Do you need to drill into the rock for that? I assume a string line is necessary to align the anchors?

4. I was thinking of using the formula 2h + L = 61 to 63 cm to achieve an optimal staircase at 31 degrees? According to the book Husets ABC, this is the guideline. Is this correct?
 
  • Hand-drawn sketch of a staircase on a slope, with text notes on dimensions and step alignment; brown area represents the hill, black lines the stairs.
It will be a wooden staircase.
 
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