The foundation decision
Pilings are the least visible and most important part of your dock. Everything above the water — the deck you walk on, the boat you park, the roof over your head — hangs on what's driven into the bottom. Choosing the right piling type for your water, your budget, and your timeline is a decision that lives with the dock for decades. Here's what each option actually offers.
Treated wood: the standard
Marine-grade treated wood pilings are the default for residential docks, and for good reason: they're economical, proven over many decades, and every dock builder knows how to drive and work with them. The treatment — pressure-forced preservatives rated for saltwater immersion — is what separates a marine piling from a fence post. Properly treated and properly driven, wood pilings serve for decades in Tampa Bay.
The vulnerability is marine borers, which is why the treatment rating matters so much — and why piling wraps are such good insurance. Wood pilings in active borer water without protection are on a shorter clock; with proper treatment and wraps, they're a completely respectable long-term foundation. Most of the docks in Tampa Bay stand on wood pilings. Most of them are fine.
Concrete: the longevity play
Concrete pilings — prestressed, steel-reinforced — are the longest-lasting option in saltwater. Borers can't touch them. Rot isn't a thing. They stand in the bay for many decades with minimal degradation. For commercial docks, public piers, and residential docks built for the very long hold, concrete is the premium foundation.
The costs are real: concrete pilings cost more per piling, need heavier equipment to drive, and are less forgiving to work with — cutting and connecting require different techniques than wood. For a residential dock, the math is a longevity-versus-budget question: concrete costs more now and asks for nothing later.
Composite and coated: the borer-proof middle
Composite pilings and plastic-coated wood pilings aim at wood's weakness: a borer-proof exterior with wood-like workability. Composite pilings (structural plastic lumber) shrug off borers and rot entirely; coated pilings wrap a wood core in a protective shell. Both cost more than plain treated wood and less than concrete, and both make sense in heavy borer water where you want wood's economy without wood's vulnerability.
The honest caveat: these are newer technologies than wood or concrete, with shorter track records. The engineering is sound and the early results are good, but they don't have the multi-decade history of the traditional options. We install them and we trust them — with that context stated plainly.
Steel: the special case
Steel pilings show up in commercial and industrial waterfront work — strong, drivable, and familiar to marine contractors. In saltwater they need serious corrosion protection (coatings, cathodic protection) or they rust aggressively. For residential docks, steel is rarely the right answer; for commercial structures with engineering behind them, it's a proven option.
How we recommend
For most Tampa Bay residential docks: marine-grade treated wood pilings, properly driven, with wraps in active borer water. It's the value sweet spot — proven, economical, and long-lived with basic protection. For the long-hold premium build or commercial work: concrete. For heavy borer water on a mid-range budget: composite or coated. We assess your water, your structure, and your plans, then recommend — and we explain the why, not just the what.
Call (301) 679-9193 or send the form for a free on-site estimate.