F/J (Finger Jointed)
Timber assembled from short pieces glued end-to-end with interlocking finger profiles, producing long, stable lengths with reduced bow and twist.
Finger jointing is the process of cutting interlocking finger profiles into the ends of short timber pieces and bonding them with structural adhesive to form long lengths. The defect-free or selected sections produce timber that is straighter, more stable, and more dimensionally consistent than equivalent solid lengths. Finger-jointed timber is widely used for primed paint-grade joinery, mouldings, lining boards, lintels, and the laminations of glulam and LVL. For structural finger-jointed timber the joint must be made under AS 5068, with specified glue and finger geometry. For buyers, F/J product is generally cheaper than equivalent solid timber and performs well in painted applications, but the joints can show through clear finishes. Specify solid (non-jointed) where a clear finish or premium appearance is required.
Values and references on this page are indicative and drawn from common industry sources. Always verify the current AS/NZS standard, manufacturer data sheet or NIAA policy publication before relying on figures for design, specification or compliance work.
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