How to Make Bullnose Stairs

Measure the width and depth of the stair tread with a tape measure. Double-check the measurements for accuracy and record these before making cuts on the bullnose tread. Depending on personal preference, you can install the bullnose tread flush with the stair or overlap it by 1/4- to 1/8-inch. If desired, include the overlap when noting the depth of the tread.

Transfer the noted dimensions to the bullnose tread and draw cutting lines over it with a marker. Cut the wood bullnose plank to size with a circular saw.

Climb to the top of the stairway and apply a coat of wood glue over the lower end of the stringer corresponding to the tread. The stringer is the wooden support on the side of the staircase.

Set the bullnose tread on the stringer, with its rounded edge facing outward. Hold a block of wood against the rounded edge of the tread and tap it lightly with a hammer to lodge the bullnose tread on the stair.

Position the tip of a finishing nail at a 45-degree angle on a corner of the tread and pound it hard so it penetrates the riser to secure the bullnose tread. Continue the process of hammering finishing nails through the tread and into the riser, spaced 4 to 5 inches along the width of the stair.

Hammer finishing nails through the edge of the bullnose tread and into the corresponding edge of the stringer at 45 degrees. Space these nails 4 to 5 inches apart.

Position the tip of a countersinking tool over each nail head and tap it lightly with a hammer so it drives the nail slightly below the surface of the surrounding wood. Continue to countersink all the nails through the riser and stringer.

Insert tinted wood putty into the nail holes with your finger. Scrape excess putty off with the edge of a putty knife so it falls flush with the surrounding surface. Leave the putty to dry for the time specified on label directions.

Repeat this process for the remaining stairs along the stairway to make these bullnose stairs as well.