Annual Deck Maintenance Checklist

Spring is the right time for an annual deck inspection — winter's freeze-thaw cycle has done its work, and a full season of use is coming. Walking through this checklist once a year catches problems while they are still small fixes.

Structural inspection

• Probe post bases with a screwdriver: soft, punky wood means rot has started.
• Check the ledger: look for gaps at the house wall, staining or efflorescence, and test the ledger-to-house connection for movement.
• Bounce on joists at mid-span: excessive flex means the joist may be undersized, rotted or the load is too heavy.
• Check all joist hangers, post bases and beam-to-post connectors for rust, missing fasteners or loose nails.

Decking surface inspection

• Walk every board: loose, bouncy or cupped boards need to be re-fastened or replaced.
• Check for end grain rot on board ends, especially boards cut to fit and left unfinished.
• Look for surface checks (cracks along the grain) wider than 1/4 inch — these trap water.
• Pour water on the surface: if it soaks in rather than beading, the sealer is due.

Railing safety check

Grab every railing post and push laterally with 20–30 pounds of force. There should be no noticeable movement. Test the top rail for continuous support. Check balusters for gaps wider than 4 inches (a 4-inch sphere must not pass through any opening). These are life-safety requirements — if the railing fails the test, repair before using the deck again.

Cleaning and sealing

Power-wash at low pressure (1200–1500 psi) along the grain. Clear all debris from between boards — trapped organic matter accelerates rot. Treat any mildew with a deck brightener. Once dry (48 hours minimum), do the bead test: if water soaks in, apply a fresh coat of sealer before the season starts.