Clinker building is a method of constructing hulls of boats by fixing wooden planks to each other so that the planks overlap along their edges. In any but a very small boat, the individual planks are also joined end to end.
The technique was developed in northern Europe and was a method of construction favoured by the Vikings for their longboats being quick to construct, easy to repair and light enough to row. The clinker built method as used by the Vikings created a vessel which could twist and flex relative to the line length of the vessel, bow to stern giving it an advantage in North Atlantic rollers. The Clinker build today lends itself to lightweight watercraft providing that traditional wooden boat appearance.