Durable Structural Components of Casein Nail-Glued Wood

The application characteristics of casein glue as a structural assembly material appear suitable, but its durability for long periods of time is questionable. Several examples of structural capabilities and durability of casein glue under design load with changing climatic conditions are given. These components under test were exposed to wet and dry, hot and cold conditions from periods of 13 to 19 months. Delamination of the hip-roof plywood gusset plates at the center lower cord joint was excessive and slippage in the plywood caused failure. The plywood failed while the casein bonds were still intact. The results indicate that: 1) Casein nail-glued bonds properly made would be entirely adequate for structural components in dry, properly ventilated structures. 2) Further durability can be obtained by increasing the specifications to include only MMM-A-125 Type II glue (mold inhibitor added) and exterior-type plywood.

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