Place two 2-by-4-by-48-inch boards parallel to each other, 21 inches apart, with the 2-by-48-inch side flat on a work surface. Set one 2-by-4-by-21-inch board with the 2-by-21-inch side flat on the work surface between each end of the 48-inch boards to form a rectangle. This is a shelf assembly. Create three more shelf assemblies with the remaining 48- and 21-inch-long boards for a total of four shelf assemblies.
Drive two deck screws through the ends of the 48-inch-long boards into the ends of the 21-inch-long boards at each joint to fasten the assemblies together using a screw gun.
Align one plywood panel on top of each shelf assembly so that the edges line up flush with the outside edges of the assembly. Fasten each panel to the shelf assembly with flush-trim deck screws evenly spaced every 2 inches around the rectangular frame using a screw gun.
Measure up 12 inches from one end of the 2-by-4-by-96-inch boards. Mark the measurement with a pencil. Measure up 36, 60 and 84 inches from that same end on each of the 96-inch long boards and mark the measurements. These are the leg boards for the shelves. The marks are the location for the bottom edge of the shelf assemblies.
Lay the shelf assemblies on the work surface with the 4-by-48-inch side flat on the surface so that the 24-inch side is standing vertically. Space the shelf assemblies at the measurements that you marked on the leg boards along the work surface.
Align the leg boards with the 4-inch side flat against the 4-by-24-inch side of the shelf assemblies at each corner so that outside edge of the legs are flush with the outside edge of the shelf assemblies. Line up the pencil marks on the legs with the bottom edge of the shelves. Drive deck screws through the legs into the shelf assemblies using two screws at each joint to fasten the shelving unit together.
Stand the storage shelf assembly upright so that it stands on the 2-by-4-inch ends of the legs. The 12-inch space beneath the bottom shelf will protect storage items from moisture on the floor and also will provide easy access without you having to bend down too far.
Things You Will Need
- 8 boards, 2 by 4 inches, 48 inches long
- 8 boards, 2 by 4 inches, 21 inches long
- Box of deck screws
- Screw gun
- 4 plywood panels, 3/4 by 24 by 48 inch
- Box of flush-trim wood screws
- 4 boards, 2 by 4 inch, 96 inches long
- Tape measure
- Adjust the size of the storage shelves to accommodate the size and needs of your space.