Install Supporting Boards and Secure Stringers — Install Bottom Support (Optional but Recommended)
Part of project
How to Build Deck Stairs with Pre-Cut Stringers · Step 2 of 6
In this video
Attach a pressure-treated 2x6 supporting board to the underside of the main deck frame where the stringers will attach. This provides a firm and stable surface for the stringers to rest against, as opposed to metal joist hangers. Carefully position the first (outer) stringer, ensuring it aligns correctly with the deck and rests squarely on the concrete landing. Screw it into place from the back of the supporting board with structural screws. Measure the spacing for the remaining stringers (e.g., 16 inches on center). Use a string line to ensure all stringers are perfectly square to the deck. Place spacer blocks between the stringers at the top and bottom to maintain even spacing. Install the middle stringer first by slotting a pressure-treated 2x4 (cut to size) into a pre-cut notch on the stringer's bottom and screwing it into the concrete landing using wedge anchors. Screw the remaining stringers to the supporting board and toenail them into the pressure-treated 2x4 at the base. Finally, screw on the decorative side pieces (skirt boards/trim boards) to cover the cut edges of the treads for a clean, finished look and added rigidity. These pieces are not structural but enhance aesthetics and lateral stability.
Install Supporting Boards and Secure Stringers — Install Bottom Support (Optional but Recommended)
Part of project
How to Build Deck Stairs with Pre-Cut Stringers · Step 2 of 6
In this video
Attach a pressure-treated 2x6 supporting board to the underside of the main deck frame where the stringers will attach. This provides a firm and stable surface for the stringers to rest against, as opposed to metal joist hangers. Carefully position the first (outer) stringer, ensuring it aligns correctly with the deck and rests squarely on the concrete landing. Screw it into place from the back of the supporting board with structural screws. Measure the spacing for the remaining stringers (e.g., 16 inches on center). Use a string line to ensure all stringers are perfectly square to the deck. Place spacer blocks between the stringers at the top and bottom to maintain even spacing. Install the middle stringer first by slotting a pressure-treated 2x4 (cut to size) into a pre-cut notch on the stringer's bottom and screwing it into the concrete landing using wedge anchors. Screw the remaining stringers to the supporting board and toenail them into the pressure-treated 2x4 at the base. Finally, screw on the decorative side pieces (skirt boards/trim boards) to cover the cut edges of the treads for a clean, finished look and added rigidity. These pieces are not structural but enhance aesthetics and lateral stability.