COMPARISON
QUICK ANSWER
On coastal NC docks exposed to salt spray, 316 stainless lasts indefinitely while hot-dipped galvanized fails in 5–7 years. The stainless upgrade costs 3–4× per fastener but eliminates the single most common cause of dock failure.
SIDE-BY-SIDE
PROS
CONS
BEST FOR
Interior framing connections completely shielded from spray (joist hangers, hurricane straps in covered areas).
PROS
CONS
BEST FOR
Every deck screw, lag bolt, through-bolt, hinge, cleat, and float connection on the saltwater side.
THE NUMBERS
| Factor | Hot-Dipped Galvanized | 316 Stainless Steel |
|---|---|---|
| Cost per fastener | 1× | 3–4× |
| Lifespan in salt spray | 5–7 years | Indefinite |
| Pitting resistance | None (zinc consumed) | High (Mo content) |
| Staining | Orange rust streaks | None |
| Compatible with PT lumber | Reacts with CCA/ACQ | Yes — fully |
| Cost on typical dock | ~$1,200 hardware | ~$3,500 hardware |
OUR VERDICT
There is no honest case for galvanized on the saltwater side of a coastal NC dock. The $2,500 spread between galvanized and 316 stainless is roughly the cost of one hardware-replacement service call ten years from now. Spec stainless from day one.
— Mark Lipe, NC GC #100980
FAQ
RELATED SERVICES
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