Long Term Effect of Preservatives on Gluelines in Laminated Beams

This paper describes results of a study on laminated wood treated after gluing and then aged up to 20 years before it was tested. It is concluded that wood properly laminated with resorcinol, phenol-resorcinol, and melamine adhesives and treated with the type of preservative warranted for the condition of use, is a dependable material for long-term exterior service. The study included laminated members of red oak, hard maple, southern pine, and Douglas-fir. Seven commercial preservatives and one fire-retardant were applied by pressure treatments to sections of twenty-eight 12-foot laminated beams of 6 by 6 inches in cross section. The preservatives were creosote, copper naphthenate, pentachlorophenol, chromated zinc chloride, Tanalith, Celcure, zinc meta arsenite, and fire retardant Formula 2 of Navy Spec. 51-C-38.

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