How to Install Deck-Stair Treads
Take a look at the basics of deck-stair construction, including lumber options, spacing and overhang distance, and types of screws and fasteners.
Common deck stair tread configurations include 2 pieces of 5/4 x 6 or 2 x 6 lumber, 3 pieces of 5/4 x 4 or 2 x 4 lumber, or a single piece of 2×12.lumber.
For 5/4 treads stringers are spaced no more than 12 inches apart.
For 2x treads stringers are spaced no more than 16 inches apart.
To minimize cracking at the ends, treads should overhang the stringers by at least 1 inch.
Before installing treads, apply copper naphthenate to be exposed cuts on the stringers to avoid rot.
For fastening, use corrosion-resistant screws long enough to penetrate the stringer by at least 1 1/2 inches.
For accuracy use a square to align screws. 4- and 6- inch wide treads get 2 screws into each stringer and 12-inch wide treads get 3 screws.