Restoring a wooden classic — hull planking
Restoring the planking of a classic wooden yacht — assessing the boards, replacing strakes, caulking and preservation.
Restoring the wooden planking of a classic is work that demands boatbuilding knowledge, patience and respect for the original construction. Planking can be built in various ways: carvel with caulked seams, clinker, tongue-and-groove or cold-moulded. Each has its own rules for repair, so the first step is to identify how the hull was built. Only then can you choose a method and materials appropriate to the original.
Diagnosis starts by looking for rot, loose joints and corroded fastenings. Soft, dark wood that smells musty is probed with a spike or screwdriver — if the point goes in without resistance, the wood is destroyed. Check the state of the frames, floors, stem, sternpost and the planking fastenings (nails, screws, rivets), because corroded fastenings destroy the wood around them (black stains from the reaction of steel with oak, for example). It is worth drawing a map of the damage, to plan the order and scope of the work.
Replacing a damaged plank means carefully removing the old one, taking out the fastenings and fitting a new one in the same or a compatible species with matching grain. The timber must be at the right moisture content and seasoned, to avoid later movement and splitting. The new plank is cut and fitted to the curve of the hull, sometimes steamed to bend it. The fastenings are chosen in materials that will not cause galvanic corrosion with the neighbouring parts.
In carvel construction, sealing the seams between the planks is crucial. Traditionally, caulking (cotton or hemp) is driven into the seams with a special iron and a mallet, and then the seam is payed or filled with a seam compound or stopping. Caulking properly takes skill — too hard and it forces the planks apart, too soft and it leaks. After launching, the wood swells and the seams close, which is why a freshly restored classic often leaks at first until the planking takes up. That is normal and has to be expected.
Preserving the wood means treating it against fungus and insects and rebuilding the protective coatings. Underwater and topside surfaces are protected differently: the underwater part with primer and antifouling, the topsides with paint or varnish depending on the boat's style. Restorations often use epoxy resin systems for saturating and bonding (WEST System and the like) where the construction allows, though with traditional working planking you have to be careful about stiffening it. The choice of method should follow from whether the hull is meant to work flexibly or be sealed rigidly.
Restoring a classic is a long-term project, usually carried out section by section, so as not to disturb too many structural members at once and lose the shape of the hull. It is worth documenting photographs, dimensions and the arrangement of the parts before dismantling, because recreating the geometry can be difficult. The work needs joinery and boatbuilding tools, space under cover and control of the timber's moisture content. This is a job for someone experienced, or under the eye of an experienced boatbuilder.
Safety covers protection from wood dust (mask, extraction), care with cutting tools and ventilation when using preservatives, resins and paints. Old coatings may contain harmful compounds (old lead paints, for instance), so take particular care when removing them and avoid creating dust. Dispose of removed and unused timber as the regulations require, especially where it is soaked in chemicals. A patient, staged restoration gives a classic back not only its soundness but also its historic value.
Material prices — products and options
Indicative prices in EUR (incl. VAT), as of July 2026. Products widely available in Europe; prices depend on the shop, the pack size and consumption. The links lead to example shops that ship across the EU. Dollar amounts are converted at 1 EUR = 1.1622 USD (ECB, 7 September 2026) and rounded — treat them as a rough guide, not a price in a US shop. Imperial values in brackets are conversions of the metric figure.
Boatbuilding timber of the right species, seasoned
- TOPLICHT — boatbuilding timber and plugs
teak, mahogany, oak, Oregon pine and plugs (bungs) for covering fastenings — by the dimensionby the dimension - Robbins Timber — boatbuilding timber
seasoned boatbuilding timber and marine ply cut to size (UK, shipping)by the dimension
Caulking (cotton/hemp) and a caulking iron
- TOPLICHT — Caulking Cotton
cotton for caulking the seams of carvel planking, twisted cord€10–40 (≈$12–46) - TOPLICHT — Oakum (tarred caulking)
manila fibre caulking impregnated with tar, for wider seams€15–45 (≈$17–52) - TOPLICHT — caulking irons and chisels
traditional caulking irons for driving in the caulking€20–60 (≈$23–70)
Sealing compound / stopping for the planking seams
- TOPLICHT — seam compounds and stoppings
traditional seam compounds for finishing caulked seams€15–45 (≈$17–52) - Sika — Sikaflex 291i
flexible PU adhesive sealant for seams and joints (the modern solution), 300 ml (10 fl oz)€8–15 (≈$9–17)
Fastenings in consistent materials
- TOPLICHT — silicon bronze screws
corrosion-resistant bronze screws, bolts and rivets for wooden planking€0.30–3 (≈$0.35–3) / pc - A4 stainless fastenings
an A4 steel alternative where it is acceptable (keep the materials consistent!)€0.50–3 (≈$0.58–3) / pc
Treatment against fungus and insects / wood protection
- Owatrol — D1 (Deks Olje)
saturating oil that impregnates wood, protecting planking and fittings, 1 l (0.3 US gal)€26–40 (≈$30–46) - TOPLICHT — wood preservatives
fungicidal and insecticidal treatments for boatbuilding timber€20–50 (≈$23–58)
Epoxy resin for saturating and bonding
- WEST System — 105 + 205 / 0.6 kg (1.3 lb)
resin + fast hardener set for small repairs€38–50 (≈$44–58) - WEST System — 105 + 205 / 1.2 kg (2.6 lb)
larger set for laminating and bonding planking€70–85 (≈$81–99) - WEST System — Handy Pack
practical repair kit with dispensers and fillers€40–70 (≈$46–81)
Tools, moisture measurement, safety gear
- Wood moisture meter
meter checking the state of the wood before treating or bonding it€20–60 (≈$23–70) - Dust mask, goggles, gloves
protection when sanding wood and working with epoxy (safety set)€25–60 (≈$29–70)