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Begin installing the risers and treads starting from the bottom of the stairs. Apply a bead of construction adhesive along the top edges of the stringers where the treads will sit. This is crucial for preventing squeaks and adding strength. Place the tread firmly onto the adhesive, ensuring it is flush with the front of the riser. Nail the tread to the stringers using 8-penny nails. Then, nail the riser into the back of the tread and into the stringers. Continue this process, installing one riser and then the corresponding tread, working your way up the staircase. At the very top, before installing the final riser, nail a 1-inch strip of wood to the top of the last tread. This strip, combined with the thickness of the riser and finished floor, will ensure a flush transition to the upper level.