Things You'll Need
Commercial household cleaner
Galvanized steel sheet
Electric sheet metal shears
Double-sided butyl tape
2-inch metal screws
Drill with screwdriver bit
Quonset huts are rounded, prefabricated metal structures that are often used as storage facilities. The hut is based on the British Nissen hut that was mass-produced during World War I. Today's structures are durable but not entirely impervious to damage, which can cause water leakage. You can repair your Quonset hut's corrugated metal roof with a metal patch. You will need to clean and prepare the metal roof properly to ensure an effective patch repair and use butyl tape to compensate for the roof's curve.
Remove any dirt or debris from the damaged area with a commercial household cleaner and scrub brush. Use a wire brush to remove any loosened or damaged metal coating. Wipe down the area with a rag before continuing.
Measure the damaged area and add 4 inches to this number. Slip on a pair of work gloves and safety goggles before securing the galvanized steel sheet to a work bench with two C-clamps, one on each side.
Draw a template, according to the measurement taken earlier, with a permanent marker. Cut out the galvanized steel sheet with electric sheet metal shears. Work a piece of fine-grit sandpaper over the sharp edges of the newly-cut galvanized steel sheet.
Mask the area around the damaged section with double-sided butyl tape. Butyl tape provides a moisture barrier around the damaged area of the curved roof section.
Center the galvanized steel sheet over the damaged area so that it also covers the butyl tape. Attach the steel sheet to the roof with 2-inch metal screws and a drill equipped with a screwdriver bit. Space the screws at least 1 to 2 inches apart to create a tight seal.
Run a bead of silicone caulk around the sides of the patch to form a waterproof seal. Smooth down the caulk and work it into the gap between the metal roof and steel patch with your finger.
Work the sheet metal shears slowly through the galvanized steel to prevent injury and to create a straight line.