Storage sheds are beneficial if you lack storage space to store unused items and tools. Building a 5-foot-by-10-foot storage shed with a simple flat roof on already level ground is an achievable task, requiring a few days of work. All you need to build one are a few basic tools, four types of lumber and hardware.
Cut the 6-by-8s for the base of your shed. Cut eight 4-foot-1-inch pieces, and leave four pieces at 10 feet long.
Assemble the first layer of the 5-foot-by-10-foot frame for the floor on the leveled area using six 6-by-8s and penny nails. Lay two of the 4-foot-1-inch 6-by-8s on the wide edge between the 10-foot 6-by-8s (lay these on the wide edge), forming a rectangle. Insert the other two 4-foot-1-inch pieces inside the frame perpendicular to the 10-foot pieces for floor support and equally space them out. Attach them to the 10-foot outer sides.
Repeat Step 2 and build another section of the frame directly on top of the first layer using the six remaining 6-by-8s. Attach the two layers of the frame together with penny nails.
Align the 5-foot-by-10-foot sheet of 3/4-inch sheet of plywood over the frame. Attach it by driving 2-inch nails down through it all the way around the frame, including the support beams.
Before constructing the four walls, figure out which wall will have the doorway. A 3-foot-wide by 7-foot-tall opening provides ample room. Use two 2-by-4s on each side and along the top for the frame. Incorporate the doorway into the wall frame.
Construct the rectangular frames for the two 10-foot walls using 2-by-4s and 2 1/2-inch nails. Each frame includes two 10-foot pieces and two 6-foot-9-inch pieces. Add 6-foot-9-inch 2-by-4s for the vertical studs between the top and bottom 10-foot pieces, and space them 8 inches apart.
Construct the two 5-foot walls so they are 4 feet 5 inches long. They fit between the 10-foot walls.
Stand all four walls up around the plywood floor. Nail them to the plywood base with 2 1/2-inch nails every 6 inches all the way around and to each other every 4 inches from top to bottom.
Cut five 8-foot 2-by-4s for the horizontal supports across the top of the shed for the flat roof. Lay them flat across the two 10-foot walls parallel to the 5-foot walls and equally space them out. Nail them to the tops of the wall frames with 2 1/2-inch nails.
Align the other 5-foot-by-10-foot sheet of 3/4-inch plywood over the roof supports. Attach it to the supports with 2-inch nails.
Cover the outside of all four shed walls with 1/2-inch plywood. Attach it to the studs with 1 1/2-inch nails.
Add protection to the roof using tin. Cut pieces and nail over the roof.
Use lightweight plastic doors cut to fit the doorway, or cut your own using plywood. Hang your doors with heavy-duty hinges.