Finger-Jointed Dimension Lumber–Past, Present and Future

Finger-jointing of structural, dimension lumber is a spinoff from technology developed for laminated beams. Consistent, high-quality end-gluing is needed to develop market confidence in finger-jointed dimension lumber. Finger-joint design and gluing fundamentals are important to structural reliability. Total quality control through proof loading is proposed because every finger-joint machine occasionally produces a bad joint. The author feels that a proof load stress equivalent to 1.62 times the design stress of the member represents a minimum stress for complete assurance of product reliability for normal duration of load. He feels that tension proof loading is preferred to a bending load. Product appearance influences the saleability of fingerjointed dimension lumber, especially if the market is a retail or a wholesale distribution yard. Finger-jointing constitutes a potential for improving the efficiency and profitability of dimension mills. The sawmill of the future may finger-joint all of its short lumber (6- to 10-ft.) that now commands relatively low prices, as well as short, odd lengths that are now converted into chips.

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