Summary
The major trend in Canada and the United States is towards continuous, high-speed finger-jointing processes for finger-jointing visually-graded lumber. A recent development in Canada is the “blow-dry” method of glueline heating, which permits all sizes to be made with either vertical or horizontal finger-joints, and also permits unseasoned lumber to be processed. Five existing Canadian plants and two now under construction are all based on this process.
Canada has developed special standards for finger-jointed, visually-graded lumber. These include a product standard and a separate standard on which quality assurance and product certification is based. Strength assurance is based on bending tests of the finger-joints, while durability assurance is based on delamination testing. In addition, finger-jointed lumber in the three highest stress grades is 100% proof-tested at 1.33 times the allowable design value.
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References
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© 1982 The United Nations, New York and Martinus Nijhoff / Dr. W. Junk Publishers, The Hague
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Carroll, M.N. (1982). Finger-Jointing Sawn Lumber: Techniques and Product Requirements. In: Prins, C.F.L. (eds) Production, Marketing and Use of Finger-Jointed Sawnwood. Forestry Sciences. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-3859-6_27
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DOI: https://doi.org/10.1007/978-94-015-3859-6_27
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-015-3769-8
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