Double Mortise and Tenon Joint

Double Mortise and TenonThere are times that tenons will get in the way of each other, weakening the entire joinery area. This issue can be particularly common on a queen post truss where the tie beam, rafter, and post collide.   A double mortise and tenon on top of the queen posts can solve the problem and is the solution used in this instance.
Instead of a typical 2-inch tenon, two 1-1/2″ tenons are used on top of the post. They are spaced 1-1/2″ apart and are in line with the mortise on the tie beam. Two pegs hold the post to the tie beam.

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