Tongue and Groove Joinery

After allowing the tongue and groove assembly to dry in the clamps for 24 hours, it's time to trim the ends.

Remove the assembly from the clamps. With a square, align a straight-edge square to the sides of the assembly (perpendicular to the tongue and groove joints). Clamp the straight-edge in place so you can trim off just enough of the bottom edge of the assembly with a circular saw to ensure that the bottom will be square to the joints.