Build a strong, dry, inspectable substructure
Posts, footings, beams, joists, ledgers, lateral connections, flashing, ventilation, drainage, and appropriate hardware make up the structure beneath the boards. The visible decking can only perform as well as the frame and water details supporting it.
Existing decks need evaluation for condition, spans, connections, settlement, corrosion, trapped moisture, and foundation capacity before they are reused or asked to support new work.

