"You can absolutely cut a stair stringer if only you only knew the way the math works," my dad once said to me. So, long before I ever had a geometry class, I knew the math behind determining a slope.

Mark on the wall where you want the stringer to end, then measure the length of the string, add an additional 18 inches, this is the length of the — x 12 you will need.

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 ...

Step 1: Sand the outer edge of a 2×12 board to make it as smooth as possible. When using stair gauges, a nick or knothole along the edge could offset the measurements enough to make the stairs ...