How to Repair Broken Stair Stringers

Tools and Materials:

- Pry bar

- Hammer

- Saw (hand saw or circular saw)

- Measuring tape

- Level

- Wood glue

- Clamps

- Wood screws

- Safety goggles

- Dust mask

Step 1: Safety Precautions

- Ensure that the staircase is stable and won't collapse during the repair.

- Wear safety goggles and a dust mask to protect yourself from debris.

Step 2: Remove the Broken Stringer

- Locate the broken stringer and assess the damage.

- Use a pry bar to carefully remove any nails or screws holding the broken stringer in place.

- Remove the broken stringer from the staircase.

Step 3: Measure and Cut the New Stringer

- Measure the length of the old stringer and use it as a guide to cut the new stringer.

- Cut the new stringer to the appropriate length using a saw.

Step 4: Secure the Stringer

- Position the new stringer in place. Use a level to ensure it's straight.

- Secure the stringer to the stair treads with wood screws. Make sure the screws are long enough to penetrate both the stringer and treads.

Step 5: Reinforce the Stringer with Glue and Clamps

- Apply wood glue to the joints where the stringer meets the treads and the bottom of the staircase.

- Secure the stringer in place with clamps. Leave the clamps in place until the glue has completely dried according to the manufacturer's instructions.

Step 6: Check the Stability

- Check the stability of the newly installed stringer by applying weight to the stairs. Make sure there's no movement or bending.

Step 7: Clean and Finish

- Remove any excess glue and clean the area around the repaired stringer.

- Apply a wood stain or paint to match the existing stairs, if desired.

Remember, working on stairs can be dangerous, especially when they are unstable. If you're not confident in your abilities, it's best to consult a professional contractor for the repair.