Deck failures rarely happen without warning. These are the signs worth checking now, and the one that means you should stop using it today.
Decks almost never fail without warning. They give signals for months or years first, and most of those signals are visible to anyone willing to spend twenty minutes looking. Here is what to check, roughly in order of how much it should worry you.
Start with the ledger board — the piece of framing that attaches the deck to your house. This single connection causes the majority of catastrophic deck collapses. Look underneath the deck where it meets the wall. You want to see substantial bolts, not nails, and you want to see flashing above the ledger directing water away from it. If you see nails, or no flashing, or dark staining and soft wood at that joint, treat it as urgent. This is the one item on the list that justifies keeping people off the deck until it is inspected.
Second, check for movement. Stand on the deck and shift your weight side to side, then push against the railing. A deck should feel dead solid. Any sway, bounce, or give in the railing means a connection somewhere has loosened, and connections do not tighten themselves back up.
Third, probe the posts at ground level. Take a screwdriver and press it into the wood where each post meets the ground or its footing. Sound wood resists. If the screwdriver sinks in easily, that post is rotting from the bottom, which is exactly where you would least like it to happen. This is common in our climate — humid summers and posts set in contact with soil or standing water are a poor combination.
Fourth, look at the fasteners. Rusted, weeping, or backing-out screws and nails are telling you the hardware was not rated for the treated lumber it went into. Modern pressure treatment is corrosive to standard fasteners, and older decks frequently used hardware that could not handle it. Rust stains streaking down from every fastener are a clear sign.
Fifth, check the decking boards themselves, particularly where they sit over a joist. Boards that cup, split at the ends, or feel spongy underfoot are past their service life. This is often the least serious item on the list — decking is a surface layer, and replacing it while the frame underneath is sound is a comparatively modest job.
Sixth, look at the stairs. Stringers — the sawtooth boards supporting the treads — carry a lot of load through a small cross-section, and they rot from the bottom like posts do. Uneven riser heights are also worth noting, since inconsistent steps are a genuine trip hazard.
Seventh, check railing height and spacing if the deck is more than thirty inches off the ground. Balusters spaced more than four inches apart are a safety issue in a house with small children, and older decks were often built before that was standard.
The reason we suggest checking before summer rather than during it is scheduling. Everyone discovers deck problems on the first warm weekend, and that is exactly when every contractor in Alamance County is booked. A repair identified in late winter gets done on your timeline.
One last point worth making: finding problems does not automatically mean rebuilding. We inspect the frame before quoting, and quite often the structure is sound and only the surface needs work. An honest assessment is worth having before you budget for a full replacement.