Sawn timber is extended using finger joints when there is a need for pieces of timber that are longer than normal or certain properties are required of the timber. By using finger joints, it is possible to produce, for example, pieces of sawn timber that are made completely of heartwood, completely knotless and very straight. Such special products are usually used in the furniture and window industries.
Finger-jointed sawn timber is available with a sawn surface, dimensioned and planed. The maximum length varies between different manufacturers, but is usually 12 – 14 metres.
The manufacture of finger-jointed sawn timber meant for use in construction is subject to a permit, and such timber must carry a stamp indicating that finger-jointing in accordance with the product standard has been used.