Step 2 · Select Stringer Material

Select the lumber for your stair stringers. Pressure-treated lumber is highly recommended for exterior applications like decks to resist rot and insect damage. Common choices are 2x12 boards. Ensure the boards are straight, with minimal warping or cupping, and free from large knots or cracks that could compromise their structural integrity. The length of the stringers will depend on the total run of your stairs.

Tools and Materials