Everything above the water depends on what's below it
A dock is only as good as its pilings. The decking can be brand new, the rails straight, the hardware shiny — but if the pilings are hollowed by marine borers or rotted at the waterline, the whole structure is living on borrowed time. In Tampa Bay, piling failure is the number one structural problem we see, and it's almost always invisible from the deck. The dock looks fine. Underneath, the foundation is going.
That's why piling replacement is a specialty, not just a line item. Driving a new piling next to a failed one, tying it into the existing frame, and doing it without tearing apart the dock above takes experience with this specific water and these specific bottoms. We've replaced pilings under docks all over Tampa Bay — in deep canal mud, in firm bay sand, and in spots where the only way in is by barge.
Why Tampa Bay pilings fail
Three culprits, usually working together. Marine borers — shipworms and gribbles — are the big one in saltwater. Shipworms are actually clams that tunnel through wood below the waterline, hollowing a piling from the inside while the outside looks almost normal. Gribbles chew the surface at the waterline, hourglassing the piling until it necks down to nothing. A piling can lose most of its strength with barely a visible sign.
Rot is the second, hitting the zone right at and above the waterline where wood stays wet and warm — Tampa's climate is basically a rot incubator. The third is simple age and under-building: pilings set too shallow in soft mud slowly lose bearing, and undersized pilings flex with every wave until the connections work loose. Add a storm that shoves the whole dock sideways, and marginal pilings give up.
How we test your pilings
We don't guess — we test. Sounding: we strike each piling and listen. Solid wood rings sharp; hollowed wood thuds dull. Probing: we work an awl or probe into the waterline zone, where borers and rot concentrate, and feel for softness. Movement check: we push and watch for flex at the mudline that shouldn't be there. Visual: we look for hourglassing at the waterline, cracking, and the telltale small holes of borer entry.
Then we map it. You get a straight report: which pilings are solid, which are marginal, which are done. We don't recommend replacing pilings that have years left — but we also don't tell you a hollow piling is fine because the deck above it looks nice.
Replacement, done right
We drive or jet the new piling to real bearing depth — matched to your bottom, not a standard number. The new piling is marine-grade, rated for saltwater immersion, and sized to match or exceed the original. We connect it into your existing framing with proper through-bolts and bracing, not a couple of lag screws and hope. Where the old piling is in the way, we cut it off below the mudline and pull what we can.
For pilings that are marginal but not failed, piling wrap is sometimes the right call: a PVC or polyethylene sleeve sealed around the piling at the waterline zone that blocks borers and slows rot. It's a fraction of replacement cost and buys real years — but only when the piling still has structural integrity to protect. We'll tell you honestly which side of that line yours are on.
How many pilings, and what does it take
Most jobs are a handful of pilings — the two or three that failed first. Sometimes it's a full re-piling when borers got the whole field. Either way, we work in sections so your dock stays standing through the job; we don't pull the foundation out from under the whole structure at once. Typical piling jobs run a few days. Full re-pilings take longer and we schedule them to minimize the time your dock is out of service.
Our process
Step one: we visit and test every piling, then show you the results — which ones failed, which are marginal, which are fine. Step two: you get a written estimate with the count, the piling spec, and the method. Step three: we schedule and do the work, usually driving pilings with a barge-mounted or shore-based rig depending on your site. Step four: we tie everything into your frame, clean up, and walk it with you. No surprises, no upsell — just the pilings your dock actually needs.
Every project is different — contact us for a free written estimate.
Call (301) 679-9193 or send the form for a free on-site estimate.