Stair-tread double check
When laying out stairs, I use a small story stick to ensure even spacing. Once I’ve determined the rise and run of the stair and I’ve affixed the stair nuts to my square, I lay out the first tread and riser. Next I use a small, straight piece of scrap wood to note the diagonal distance between the tread line and the riser line, as shown in the drawing. With this distance marked on my story stick, I go the length of the stringer, marking the distance for each tread and riser. Then I abut the other stringer to the one I’ve marked, and I transfer the marks to the second stringer. Using these marks as control points, I can now finish my layout with the square without fear of the layout running off.
Richard Mead, Dryden, NY