DIY: How to Install a Bull Nose on Stairs

Remove with a jigsaw any tongue present in the floorboard installed on the step, leaving the face of the board flat.

Measure the length of the stair tread with a tape measure, and then measure the distance between the floorboard on the stair tread and the front edge of the step, including the riser.

Cut the bullnose molding to match the measured length. Measuring from the curved front of the molding, find the width of the gap between the installed floorboard and the front edge of the step and mark it lengthwise on the molding. Cover the mark with a piece of clear masking tape to keep the surface from chipping or splintering as you make your cut.

Lay the piece of molding onto a flat cutting surface with the rear of the piece facing upward so that you can see the cutting line. Clamp the molding in place using C-clamps to hold it steady as you make your cut.

Cut the molding along the marked line with a circular saw using a fine-toothed blade to avoid chipping. Remove the masking tape from the piece of molding after cutting.

Place two parallel beads of construction adhesive along the bottom of the bullnose molding and one along the rear edge of the molding piece where it meets the floorboard on the step. Place the molding onto the step with the bullnose front of the molding flush with the edge of the riser at the front of the step, and the rear of the molding butted against the flat edge of the floorboard.

Tape the joint between the molding and the board with masking tape to hold it in place as the adhesive sets.