You can add additional storage to your existing shed by making an attached shed. Your existing storage space must be structurally sound and have an exterior wall that you can attach this storage space to. It allows homeowners to store lawn mowers, kitchens, garden supplies, and many other things. Here are some comprehensive building instructions for building a terraced shed for some extra storage.

build a shelf board

Make a stringer board to attach to an existing wall and support the top end of your roof. Take a measurement from one outside wall and cut the board with a circular saw to the same length. Use a 2-by-4-inch board for a short bar and 2/6 for a longer one.

Attach the shelf board to these studs on the existing strong partition with a long screw and a screw gun. You can choose to remove the existing wallcovering or leave it in place. Level the ledger through one level above that of the outside wall of the shed. The owner may build the roof on any pitch or slope, but it must have a slope of 1 inch for every 10 feet that it extends from the rake board. Follow the shed plan meticulously to get the expected results.

Connect the shelf boards

Connect the ends of a stringer board and the ends of an exterior wall with 2-by-4 boards cut at any angle to fit between those walls. Nail those to the outside of a ledger board and wall. Add internal 2/4 inches of joists to make this shed over 4 feet. Cut these ends at angles to fit between the partitions and fasten in place.

Install 1 x 4-inch siding strips along the joists, shed end to end. Nail these ends to each joist in 12-inch increments from the outside outside to a stringer board. Level them.

Cover the Lean-to-Roof

Cover the attached storage area with a corrugated metal roof. Position the first panel at one end of the roof and secure it to the siding strips at the top and bottom with a rubber thumb screw and screws. Never drive a screw into the last valley where the next panel will overlap.

Add another panel to one side while overlapping the ripples. Cover the bottom of the top and add a second row of panels on top, if needed, overlapping the bottom row by 6 inches. Panels are typically 8 to 10 feet long, but you can get longer lengths. Use tin snips or a hacksaw to cut the panels to fit your needs.

make the roof waterproof

You must put metal flashing on top of the corrugated roof when you make an attached shed. Nail the roof to the wall of the building and overlap it to divert water to the roof. Seal the top of the metal flashing with clear silicone caulk.

Add drip edges on all sides of the roof and metal flashing elements that deflect water from the top and seal sharp edges. Metal flashing is metal bent to overlap a straight wall and sloped roof. The drip edge is a metal seal at the ends to prevent moisture from entering.