Wooden boats rarely die of old age. They die of decisions, a patch in the wrong species, a winter spent under a sealed cover, a layer of polyester laid over timber that was already damp. Almost every wooden hull we condemn was killed by work done to it, not by time.
This page collects the mistakes that recur, in the order they cause damage. It applies to gulets, tirhandils and classic wooden yachts alike.
1. The Wrong Species in the Wrong Place
The most basic mistake and the most common. Timber is chosen for where it sits: below the waterline, at the waterline, on deck, inside. A species that is excellent for one is wrong for another, and a patch that moves at a different rate from the plank beside it opens a seam within a season.
What goes wrong in practice: hardwood used where a lighter timber belonged and the fastenings take the extra load; a species with high oil content epoxy-bonded without degreasing, so the bond fails; and repairs made in whatever was available at the yard that week.
2. Hauling Out in the Wrong Season
A hull lifted into a hot, dry summer shrinks fast. Seams open, fastenings work, and the boat that goes back in leaks from places it never leaked before. Where the choice exists, lifting into cooler, damper conditions is gentler on a wooden hull, and if she must come out in summer, the planking needs wetting down and shading.
3. Staying Ashore Too Long
"Just until we decide what to do" is how wooden boats are lost. Months ashore uncovered, in sun, with no moisture management, does more damage than several seasons afloat. Timber dries, shrinks, splits; fastenings lose their grip; the caulking drops out. A boat that could have been repaired becomes a boat that must be rebuilt.
4. Polyester Over Timber
Sheathing a wooden hull in polyester looks like a permanent solution and is usually the opposite. Polyester does not bond reliably to timber over time; water finds a way in at an edge or a fastening, and then cannot get out. The timber beneath rots while the surface looks perfect. The first sign is often a soft spot under a sheathing that shows no damage at all.
Where sheathing is genuinely appropriate, epoxy with proper preparation and a dry substrate is the route, and even then the moisture content is verified first, not assumed.
5. The Wrong Paint or Coating System
Coatings on timber have to breathe in one direction. A system that seals completely traps whatever moisture is already in the wood. Mixing incompatible systems, a hard coating over an oil-based one, or modern antifouling over unknown layers, lifts, and lifting paint lets water sit against the timber under a film that keeps it there.
6. Moisture Traps and No Air
Wooden boats need air movement more than they need to be dry. The places that kill them are the ones where air never moves: under a fixed sole, behind a bonded lining, inside a locker with no vent, under a tightly fitted cover. Mould and odour come from stale air far more often than from a leak.
The cheapest life extension available to any wooden boat is ventilation, cowls that stay open, soles that lift, lockers that breathe, and a cover that admits air rather than sealing it out.
7. Cosmetic Repair Over Fastenings
On a wooden hull the work begins at the fastenings. A plank refastened over corroded nails or screws is a plank waiting to move. Filling, fairing and painting over failing fastenings produces a boat that looks better and is structurally worse, and hides the evidence a surveyor would otherwise read.
8. Caulking Treated as the Problem
An opening seam is usually a symptom, not the fault. Drying, movement and failing fastenings open seams; recaulking without addressing the cause buys a season. Worse, hard compound forced into a seam that needs cotton can split the plank edge.
9. Sealing Damp Timber With Epoxy
Epoxy is a dry-timber material. Applied over damp wood it traps the moisture against the fibre and accelerates decay, and it does so invisibly, because the surface stays sound long after the timber underneath has gone. Moisture content is verified before any encapsulation, every time.
10. Electrical Work Added Over Decades
On gulets particularly, the installation has often been extended by several hands across thirty years with no single scheme. Undersized cable, unprotected circuits, multiple earth paths and connections in damp spaces are the most frequently recorded group of defects in this fleet, and the group most directly connected to fire risk aboard a timber vessel.
11. What Correct Repair Looks Like
| # | Step | Why in this order |
|---|---|---|
| 1 | Find and close the water path | Anything done while water still enters will be repeated |
| 2 | Dry, and verify by measurement | Timber sealed damp decays faster than timber left open |
| 3 | Deal with the fastenings | Structure before surface, always |
| 4 | Cut rot back to sound timber | Anything left at the boundary spreads |
| 5 | Replace in compatible species | Differential movement opens the next seam |
| 6 | Restore ventilation | Air movement is what keeps the repair alive |
| 7 | Finish the surface last | Everything above would spoil it |
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