These box shelves are amazingly sturdy due to the two-layer 1/2-in. plywood design. The thickness and overlapping joints make them strong enough to sit on, and they're easy to build.
Step 1: Assemble the Inner Box
Step 2: Secure the Outer Layer
Step 3: Apply Filler, Prime and Paint
Step 4: Secure to the Wall
Clamp a framing square on the workbench to keep construction square, butt the ends against the top and base, securing with wood glue and 1-in. brads or nails. Position the back and secure with 1-in. brads or nails 1/4-in. from the edge.
Apply wood glue in a zigzag to the top and base of the box; then, position the outer top and base, aligning them flush with the front, securing at the ends and back and clamping along the open front. When dry, secure the outer end panels.
The sturdiness of the shelves partly relies on securing the boxes to at least two wall studs to support the weight.
Use painter's tape to outline the box on the wall and mark the studs, then mark the studs on the box and drill 1/8-in. pilot holes through the back. Position the box on the outline and secure into each stud with at least two #10 x 3-in. screws near the top and two at the base.
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