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Splicing Engineered Lumber To the Editor: The article, "Engineered Beams and Headers" (8/91), presented a good review of new materials in wood. However, two items in the sidebar, "Making Connections," need revision. Beams resting in pockets must be isolated from the concrete so that moisture cannot move from the concrete to the wood beam. Making a treated wood box does not serve this purpose. A more critical error was in the "splices" paragraph. The author recommends splicing a continuous beam at the points of maximum bending moment. A reasonable estimate of the position of points of zero bending moment is at the quarter spans on either side of the center post. It is at these points that splices can be made with no effect on beam