Every year tons of old wood end up in landfill landfills as there is no lucrative alternative. A glued-laminated timber section made with salvaged lumber could make an efficient use of the salvaged material and reduce the cost of wood in the market. A 3-point bending test was conducted on a total of 120 specimens to investigate the mechanical properties of glued-laminated timber manufactured using salvaged lumber. Balanced layups were used for this test. The MOE, MOR, and reliability of the salvaged lumber were assessed according to the experimental results. The influence of the position of salvaged lumber on the MOE and MOR of glulam was investigated by one-way ANOVA. The influence of the type of adhesive used for manufacturing glulam were was also studied. The results show that that when compared with control samples of glulam, the glulam manufactured with 60% of salvaged lumber had a reduction of 10.5% in MOR, 10.5% in MFL, and 1.9% in MOE as shown in table 4.1. when compared with control samples of glulam the glulam manufactured with 40% of salvaged lumber had a reduction of 4.7% in MOR, 4.5% in MFL, and 1.35% in MOE. These reduction percentages are less than 11% for all mechanical properties. In other words, we can say that even for glulam samples made of 60% of salvaged lumber the reduction percentage for all mechanical properties is going to be less than 11%. The reduction percentage for MOE between two consecutive grades turns out to be 33% approximately so we can safely say in absence of any data about a given salvaged sample we can assume that MOE of that salvaged lumber will be one grade below the actual MOE of that sample before use.
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