Building a staircase may seem like an intimidating task at first, but with the right guidance, even a novice carpenter can construct a sturdy and attractive set of stairs. One crucial aspect of stair building is cutting stair stringers, which provide support for the steps. Follow these 15 steps to successfully cut and install stair stringers.

1. Measure the total rise: Begin by measuring the vertical distance from the lower floor to the upper floor where the stairs will be installed.

2. Determine step count and height: Divide the total rise by your desired step height (usually 7-8 inches) to figure out how many steps are needed (round up or down as needed). Then, divide the total rise by this step count to get an accurate step height.

3. Calculate tread size: Using your desired step depth (usually 10-11 inches), determine the size of each tread – this is the horizontal portion of each step that will be supported by the stringer.

4. Measure and mark layout on framing square: Align your framing square with one of its legs representing the riser height and set it to match up with the edge of a 2×12 wooden board. The other leg should represent the tread size.

5. Trace riser and tread: Use a pencil to trace along both legs of your framing square, ensuring you’re marking both run and rise on each zigzag pattern – this is where you’ll make your cuts.

6. Continue marking steps: Move your square along, maintaining accurate tread widths and riser heights for every single step until you’ve drawn all necessary markings onto your 2×12 board.

7. Add adjustment for thickness: Take into account any additional material thickness, such as plywood treads or carpeting, that may require adding extra space at each stringer’s bottom or top.

8. Cut along lines: With a circular saw, carefully cut along the drawn lines, but stop before reaching the intersecting pencil marks. Remove any remaining material with a handsaw.

9. Create a support cleat: Just below the top tread mark and flush with the top riser line, attach a small piece of 2×4 wood to offer extra support.

10. Test fit your stringer: Position your cut stringer against the stairs to ensure it aligns properly and make adjustments as needed.

11. Cut additional stringers: Use the first stringer as a template for other stringers. Trace its shape onto additional 2×12 boards and cut them following the same process.

12. Install your stringers: Attach the top of each stringer to the framing at the upper floor level with metal brackets or by “toe-nailing” them in place (drive nails in at an angle).

13. Check for evenness: Use a level to make sure all installed stringers are level with each other, adjusting as necessary.

14. Attach treads and risers: Affix your treads and risers to the installed and leveled stringers using screws or nails.

15. Double-check your work: Once all treads and risers are in place, walk up and down your staircase to ensure it is stable, comfortable, and safe.

Cutting and installing stair stringers may require attention to detail, good measuring skills, and some familiarity with power tools – but with these careful instructions and some practice, you’ll soon be on your way to building beautiful stairs!