Clinker (lapstrake) construction overlaps each plank on the one below and fastens through the overlap, building the shell first, which makes it forgiving of imperfect wood and easier for a solo builder without plans; carvel construction sets up frames first and lays planks edge to edge over them, giving a smoother, faster hull and easier plank replacement but needing caulking and more precision. For a first 4-5 m boat with rough timber and no plans, clinker is the easier route.
Part of Canoe & Rowing Boat Construction
Clinker and carvel are the two traditional ways of planking a wooden boat: overlapped planks over a shell, or edge-to-edge planks over a frame.
Two Traditions, Two Different Orders Of Work
The difference is not only how the planks meet. It is which comes first, the planks or the frame. In clinker the planks define the shape and the ribs are fitted inside afterwards. In carvel the frame defines the shape and the planks are bent to fit it. That order decides everything else: how much you need plans, how much skill the fit demands, and what happens when something goes wrong.
| Clinker (lapstrake) | Carvel (smooth) | |
|---|---|---|
| First step | Plank onto keel and stems | Frames onto keel |
| Plank joint | Overlap of 2-3 cm, riveted | Edge to edge, caulked |
| Needs plans? | Less; the shell shapes itself | More; frames fix the shape |
| Seams | Sealed by fasteners and wood swelling | Sealed by caulking |
| Hull surface | Stepped, more drag | Smooth, less drag |
| Repair | Replacing a plank disturbs its neighbours | A single plank can be replaced without disturbing neighbours |
| Scales up | Less well | Well; most large ships are carvel |
Details: Clinker (Lapstrake) and Carvel (Smooth Hull).
What You Need
- Backbone timber: a keel and stems (see Keel, Stems & Backbone)
- Planking: straight-grained boards, with or without a way to bend them (see Planking Methods)
- Fasteners: copper nails and roves for clinker, nails or screws for carvel
- Sealing materials if you choose carvel (see Caulking Materials)
Method: Choose In Three Questions
Step 1: Do you have plans and frames? For a first 4-5 m boat with no plans, clinker. The overlapping shell holds its own shape while you build it.
Step 2: How good is your wood? Clinker tolerates short, imperfect boards; carvel wants long, true planks.
Step 3: How will it be repaired? If you plan to replace single planks later, carvel is easier. If you want a hull that stays tight with no caulking maintenance at the seams, clinker removes that task, though not the need to inspect fasteners.
Common Mistakes
- Choosing carvel for the smooth hull and then having no wood to plank it — long, tight-fitting boards are the scarce item.
- Choosing clinker for speed — the carrier’s advantage of a smooth hull goes to carvel.
- Mixing the methods — a carvel hull with overlapped patches is a repair, not a design.
Safety
Steam, sharp tools, and the weight of a hull on trestles
Both methods use steam to bend ribs (see Ribs & Frames) and heavy tools; keep the hull blocked firmly so it cannot roll while you work on it, and keep your hands clear of the clenching side of nails.
What’s Next
- Learn next: Clinker (Lapstrake) — the shell-first route in steps
- Combine with: Caulking & Waterproofing — what carvel adds