Birdsmouth Joints
:
THE MITRED JOINT
is a "birdsmouth joint," a simple joint which can be readily made by the handsaw, used when a spar fits on the wall plate. A nail is shown securing it in position.
shows the birdsmouth joint where the spar runs over the outside of the wall plate, thus allowing a fixing for an ornamental finish.

Fig. 356.—Rafter and Tie Beam Joint.