Materials
Humidity and UV, not cold, are what age a deck here. That changes the ranking you'll read in national buying guides.
Freeze-thaw barely matters here. What matters is months of high humidity that keeps framing damp, UV that chalks and fades surfaces, and pollen and organic debris that hold moisture against the boards. That means the surface material question is only half the job. Ventilation under the deck, drainage, joist protection tape and correct fastener spacing decide whether a deck lasts fifteen years or thirty.
Our default recommendation for most Lake Murray projects. A capped polymer shell resists mold staining, holds color and needs washing rather than sealing. The tradeoff is heat. Dark composite boards in full afternoon sun get genuinely uncomfortable barefoot. On unshaded decks we specify lighter colorways or plan shade over the primary walking areas.
Full PVC boards are the lightest and coolest of the synthetics and the most stain-resistant, at the highest cost. They're a strong choice for pool surrounds and docks-adjacent walkways. Pressure-treated pine remains the value option and is perfectly legitimate — but plan on cleaning and re-sealing every two to three years in this climate, and expect some checking and movement on wide sun-exposed runs.
We tape joists and beams on every deck we build. It costs little and stops water sitting in fastener holes, which is where framing rot actually begins in this climate. Stainless or properly coated hardware, hidden fastener systems sized for the board's movement, and gapping that accounts for summer expansion are the other three details that separate a deck that stays tight from one that squeaks in year four.
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(803) 924-2006