Cut the scrap piece at a simple 90 degree angle.
Trim work around stairs.
Adding trim between the stairs and drywall hides any gaps and adds architectural value to a staircase.
Put on a pair of safety glasses and cut a scrap piece of stair trim molding of the same type that you plan to install.
Often it is made from the same baseboard used throughout the home but it can also have a different appearance entirely.
A stair skirt or baseboard is the trim that runs along the bottom of the wall beside the steps.
Baseboard trim can be cut with mitered corners and follow the angles of each tread and riser.