Ask what a deck is made of and everyone says wood or composite. But structurally, a deck is boards held together by steel — and on the Emerald Coast, the steel is what the environment hunts.
How salt kills a deck
Salt film keeps metal damp, and damp steel rusts continuously instead of occasionally. Worse, modern pressure-treated lumber is itself corrosive to bare and lightly plated steel — the copper in the treatment chemistry eats cheap fasteners from the inside of the joint, where you can't see it. Salt outside, treatment chemistry inside: coastal deck hardware gets attacked from both directions.
The failure you can't see
Rust bleed around screw heads is the visible symptom, but the dangerous corrosion happens inside joist hangers and post connectors — the parts carrying the load. A deck can look fine from above while its connectors thin out below. This is exactly what we check first when someone asks us to look at an older deck.
What belongs on a coastal deck
- Structural connectors: hot-dip galvanized at minimum, stainless nearest open water, with connector nails and screws matched to the connector's own rating.
- Deck screws: stainless, or high-grade coated screws explicitly rated for treated lumber and coastal exposure.
- No mixed metals: a stainless screw in a plain steel hanger sets up galvanic corrosion that accelerates the cheaper part's death.
Every connector and fastener we install goes in per the manufacturer's published instructions, and our daily photos document what actually went into your deck — not just what the estimate said.
Related: composite vs wood near salt water, keeping a coastal deck alive, and the decks service.