It is really quite easy. A stair stringer is a solid 2-by-10 or 2-by-12 cut into a corrugated geometric shape that accepts a corresponding set of stair threads (horizontal members of a staircase ...

In this video of building a large staircase, I show you how I layout a stringer. It's simple math and if you use the right tools, it is quite easy. There are also some other tips and techniques I ...