Step 3 · Mark the First Stringer Layout

Begin by marking the layout for your stair stringers. Take one of your 2x12 boards and lay it flat. Using your calculated riser height and tread depth, use a framing square to mark the first rise and run. For example, if your riser is 7 inches and tread is 11 inches, mark 7 inches up from the bottom edge, then 11 inches across the bottom edge. Continue this process, creating a series of 'jogs' that represent each step. Ensure your marks are precise. The top of the stringer will sit against the deck ledger or framing, and the bottom will rest on the ground or landing.

Tools and Materials