In this video

The installation of the risers begins, securing them with both construction adhesive and finish nails to prevent any future squeaking or movement. This ensures a solid connection between the vertical riser and the structural elements. After the risers are installed, the treads are carefully fitted. A unique method is used where a single tread is cut square and used as a gauge to check the fit against the newly installed skirt boards. This allows for identifying any areas where the skirt board might need slight adjustment (e.g., adding a 1/16th or 3/32nd inch) to accommodate a perfect fit for each tread. The treads are then installed, again using construction adhesive and finish nails. This step deviates from traditional lapped joints by relying on precise cuts and strong adhesion for a flush, tight fit rather than interlocking wood joinery for primary structural support, as the structural stringers already provide that. The video notes that traditional staircases often used notches and wedges for integral strength, which this modern approach replaces with framing and finishing materials.