Deck collapses injure hundreds of people annually across the United States, and the warning signs are almost always visible before failure occurs. In Boston, where many decks on triple-deckers and older homes are 30–50 years old and have received inconsistent maintenance, structural assessment is genuinely important.
The ledger board connects the deck to the house framing and carries the load of everyone standing on the deck. Ledger failures — the ledger pulling away from the house — are responsible for the majority of deck collapses. Warning signs: visible gap between the ledger and house, rust staining around fasteners, rot at the ledger-to-house connection (water collects here and causes accelerated deterioration), and loose or missing flashing that allows water behind the ledger. Any flex at the ledger when you apply lateral force to the deck structure is a serious warning sign requiring immediate assessment. NACHI deck inspection standards →
Posts should be plumb and show no significant rot at the base — which is where most post deterioration begins, at the soil or concrete contact. Probe the bottom 12 inches of any wood post with a screwdriver: solid wood resists; punky, soft wood that the screwdriver penetrates easily indicates rot. Footings should extend below frost depth (42 inches in Boston) — older decks sometimes have footings only 12–18 inches deep that have heaved over winter freeze-thaw cycles. A deck that's noticeably out of level may have heaved or settled footings. NADRA deck safety resources →
Look at the framing from below if accessible. Check the ends of joists where rot starts first, any joist hanger connections for corrosion or missing fasteners, and beam bearing points. Any joist that has more than 1/3 of its depth compromised by rot should be sistered or replaced immediately. In Boston, the most common joist damage location is at the ledger end (where water from the house-deck junction concentrates) and at any low point where water pools in the framing. Sistering a compromised joist adds minimal cost when caught before failure — ignoring it can result in a collapsed deck.
Massachusetts code requires railings on any deck more than 30 inches above grade, and they must withstand 200 pounds of lateral force at the top rail. Test your railing: grab the top rail and apply firm lateral pressure. Any flex beyond minor movement indicates loose post connections or rotted post bases. Railing failures are among the most common deck injuries — a railing that fails when someone leans against it at an elevated deck. We repair or replace failed railing systems as a priority item on every deck assessment. Massachusetts deck code requirements →
Need Deck Repair in Boston?
AURA Painting Inc serves all Boston neighborhoods. Licensed MA #193121, fully insured, 2-year warranty. Free estimates — most jobs scheduled within the week.
Call (617) 777-7700 ← Back to Deck Repair