How to Install Staircase Stringers

Staircases don't just function as a means to get from one floor to the next; they add character to your home. When you build stairs, the stringers provide the structural support for the treads and risers. You can make your own stringers using a template or you can buy precut stringers from home building supply stores.

Difficulty: Moderate

Instructions

Things You'll Need:

• Measuring tape
• Calculator
• Stringers or template
• Sandpaper
• Utility knife or saw
• Screws
• Level

1. Calculate the distance the stringers need to cover. You should already have the calculation for the rise and run of the stairs. If you don't buy precut stringers, you will need to cut your stringers based on the measurements you use to build stairs.

2. Figure out if you need two or three stringers. Most building codes require three stringers for stairways wider than 30 inches.

3. Test the stringers for accuracy. You want to stack all the stringers together and make sure the cuts line up. Even 1/16-inch difference causes stairs to squeak. If needed, sand the stringers to match.

4. Position the stringers on top of the skirt boards. You may need to cut the stringers with a utility knife or saw so they sit plumb to the top of floor and the first riser. Attach the stringers to the skirt board with screws.

5. Secure to stringers to the top header and the blocking for the stairs. If your stringer runs along drywall, you can add extra support by screwing the stringer into the studs along the wall.

6. Test the levelness of each section and make adjustments. For small cuts, use a utility knife or sandpaper to smooth out the variance.

Tips & Warnings

• The stringer should be a solid piece of wood, running the entire length of the stairway.