Beam: The boards that sit on top of the posts and support the joists.
Cap rail: The horizontal board that runs along the top of all posts and pickets running around a deck.
Decking: The boards that make up the surface of a deck. The decking boards are secured to the joists.
Fascia: Boards that cover the ends of the deck boards and the perimeter joists for decorative purposes.
Footing: Any concrete base embedded in the ground in order to provide the main support for the deck.
Guardrail: A lower, horizontal board that runs across the railing posts.
Joists: The boards that act as support for the decking boards.
Joist Hangers: Metal fasteners that attach joists to ledger board.
Ledger Board: The board that attaches directly to the existing structure or to lateral joists.
Piers: Concrete blocks located above the footing. Usually 6 inches high.
Porch: Any opened or closed, covered projecting entrance to a house or building.
Posts: The vertical supports that rest on piers and support the beam, most often built from 4×4 pieces of lumber.
Post Anchors: The metal brackets that connect the piers to the posts.
Railing Post: The vertical posts that hold the rail.
Rim Joist: The joist which runs up against the joist ends, usually on the far side of the deck, away from the house. Also called the perimeter joist.
Rise: The height of a step.
Riser board: The vertical board attached to the front of a step, between treads.
Run: The length of a step.
Stringer: The end pieces that hold the stairs and steps together, and onto which the treads are attached.
Top rail: The upper, horizontal board that runs between the railing posts.
Tread: Horizontal board that makes each step in a stairway.