> The first problem you’ll encounter is that cutting your 2x12s to the right angle is a bit complicated because there’s no obvious way to trace the correct angles. You can either get creative (there is a way to trace it), or you can bust out your trig book and figure out how to calculate the angle and position of the cuts.
My first thought would be using a string: Fix a string to the floor at one end and to the wall with the other end, at the places where you want the upper edge of the 2x12 to meet the floor and wall (the exact locations are "input parameters" that depend on your design, i.e. on how steep you want the stairs to be - you can't trace or calculate them)
Then pull the string taut and now you can measure the exact length that is suspended in the air (which will be the length of the 2x12's upper edge) as well as the inner angles it has with the ground and wall (which will be the cutting angles from the upper edge towards the lower edge).
Of course even this is easier said than done. I'd assume that keeping the string taut and not hanging through might be a problem (catenary curve etc).
My first thought would be using a string: Fix a string to the floor at one end and to the wall with the other end, at the places where you want the upper edge of the 2x12 to meet the floor and wall (the exact locations are "input parameters" that depend on your design, i.e. on how steep you want the stairs to be - you can't trace or calculate them)
Then pull the string taut and now you can measure the exact length that is suspended in the air (which will be the length of the 2x12's upper edge) as well as the inner angles it has with the ground and wall (which will be the cutting angles from the upper edge towards the lower edge).
Of course even this is easier said than done. I'd assume that keeping the string taut and not hanging through might be a problem (catenary curve etc).