Can new boards go on old framing?
Sometimes, after a competent inspection confirms the framing, ledger, flashing, footings, connections and guards are suitable. Removing old boards can reveal hidden damage. Existing joist spacing may not suit a new material, diagonal layout or stair detail. Budget for repairs before assuming a surface-only replacement.
Support and attachment
Use the span table and installation guide for the exact board and application. Stair stringer spacing can differ from deck joist spacing. Butt joints may require added support. Hidden fasteners must be approved for the profile, not merely fit inside the groove. Face-fastened boards need the correct screw, pilot-hole procedure and edge distances.
Wood and polymer movement
Wood width changes with moisture condition. Manufactured boards can require temperature-based end gaps and particular fastening sequences. Ventilation, drainage and storage affect the installation. Follow the named system; universal spacing numbers can be wrong for a different board or climate.
Details people forget
Plan perimeter transitions, fascia, stairs, access panels, furniture loads and a method for replacing a single damaged board. Check clearances and local approvals. Keep the final installation guide, product labels and photographs. A surface board is not a structural framing member unless specifically documented for that use.