As shown in the picture, a butt joint is where one piece of stock is butted against another and affixed with glue. The joint is usually strengthened by screws or nails.
The strength of a butt joint comes from the glue in the joint. However, there are two problems with using glue as the only means of holding the connection.First, when glue is applied to the end grain of a board, it tends to soak into the stock far more than glue applied to the side of the grain. The end grain is the most porous part of the wood, so you may need to apply a bit more glue than normal.
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