How to Make a Door for a Shed With Aluminum Siding

Install the hinges for the door on the exterior door trim to the right of the opening. Place the top hinge 12 inches from the top of the door opening, and the bottom hinge 12 inches from the bottom of the door opening. Use the screws that come with the hinges. Doing this first will allow you to accommodate for the hinge placement when installing the J-channel trim for the siding.

Measure the dimensions of the door. Use a utility knife to cut the aluminum siding J-channel trim to fit around the door. To accommodate mitered corners, the top J-channel should be 2 inches wider than the door's opening, and the side J-channels should be 1 inch longer than the door's height. Use snips to miter the corners where the J-channels meet.

Nail the J-channel to the door opening with roofing nails. The nails should be spaced 12 inches apart. Use a utility knife to trim the channel's nail strip around the hinges if the placement of the hinges and the J-channel overlaps.

Measure the inside of the door opening, then subtract 2 inches from the side-to-side measurement and 2 inches from the top-to-bottom measurement. Use a table saw to cut a piece of OSB panel to these dimensions.

Measure the exterior perimeter of the OSB panel. Use a table saw to cut four 2-by-4 pieces of lumber fit to line the perimeter of the OSB panel. Nail the 2-by-4 pieces of lumber to the perimeter of the panel's front side so the outer edges of the lumber are flush with the edges of the panel.

Measure the horizontal distance across the middle of the OSB panel from one side of the 2-by-4 perimeter to the other. Cut a 2-by-4 piece of lumber to fit across this space, then nail the 2-by-4 into place inside the 2-by-4 perimeter you nailed around the outside of the panel.

Measure the space between the trim pieces you nailed around the door opening in Step 3. Subtract 1/2 inch from the side-to-side measurement and 1/4 inch from the top-to-bottom measurement. Cut T1-11 siding to these measurements. Use a table saw to make these cuts.

Lay the OSB panel on the ground with the 2-by-4s facing up. Place the T1-11 siding centered over the OSB and screw the siding to the 2-by-4s with wood screws.

Stand the OSB panel door upright, centered in the door opening and ask a friend to hold the door in place. Screw the hinges to the siding.