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Engineered Wood Products

Wood Adhesive Standard: Commentary and Guidelines for UseCompleted

Project leaders: Lum, Conroy



This project produced a Commentary in support of the new structural wood adhesive Standard, CSA O112.9 - Standard Specification for Evaluation of Adhesives for Structural Wood Products (Exterior Exposure). This Commentary was published with the new Standard which was released in early 2005—the first Canadian wood adhesive Standard since 1977. Unlike previous wood adhesive Standards that lacked accompanying background information, the Commentary is expected to greatly facilitate the evolution of the Standard as new adhesive technologies are developed, and aid in the implementation in glued wood product Standards. As part of the development of the guidelines on the use of the Standard, tests were undertaken to assess the suitability of CSA O112.9 for assessing adhesives for glulam applications. The study focused on gap-filling adhesives, and the sensitivity of non-gap-filling adhesives to bond line thickness variations. The key findings from these studies were that traditional adhesives classified as “non-gap-filling” were found to have some gap-filling abilities. The implication is that new alternative adhesives that are evaluated as “non-gap-filling” should probably be evaluated to see if they possess the ability to accommodate the bond line thickness variations that normally occur in bonding glulam. In another study that evaluated the suitability of using the CSA O112.9 Standard to evaluate gap-filling adhesives, some difficulties were encountered in applying the Standard and not all of the test results were consistent with historical performance. Therefore the application of the new Standard to assess thick bond lines is not recommended until retesting can be done, particularly the creep test. A procedure for preparing creep specimens with uniform thick bond lines should first be developed before applying the creep test of the Standard.

Start date: 2002-04-01 End date: 2003-03-31



For more information on this project, please contact:

Lum, Conroy
Email: conroy.lum@fpinnovations.ca
Telephone: (604) 224-3221
Fax: (604) 222-5690
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