How to Build a Columned Room Divider

For each box, the top and bottom capture the sides. Lay the bottom piece on a workbench, run a bead of construction adhesive along the edge of one side piece, then clamp it upright to form an L with the bottom. Repeat on the other end. Tip the assembly so that you can countersink pilot holes for 1½-inch MDF screws through the bottom and into the edges of the sides. Drive the screws and remove the clamps. Set the assembly upright. Apply construction adhesive to the top edges of the sides, and set the top in place. Clamp it down at each side, countersink pilot holes, and screw it in place, as shown.