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Apply a bead of subfloor adhesive (Liquid Nails) to the top edges of the stringers where the treads will rest. This helps prevent squeaks and adds structural integrity. Place the cut treads (2x12 lumber) on top of the adhesive and stringers, ensuring they are flush with the nosing and securely fasten them with deck screws. For a cleaner look, use three screws per tread, strategically placed to minimize visibility.