Put on gloves to protect your hands. Aluminum that is torn has sharp, jagged edges and can cut you easily.
Square out the hole with aluminum snips to have even edges to work with.
Hold a piece of aluminum over the squared hole to size it up. Cut the aluminum patch to overlap the squared hole by 2 to 3 inches.
Lay the aluminum patch over the squared hole and hold it in place with weather-resistant butyl tape.
Secure the aluminum patch to the roof using aluminum screws and a screw gun.
Spread a bead of caulk with a caulk gun around the edges of the patch, letting the caulk dry for about a half-hour.
Cover the patch with liquid roof coating, using a paint roller to seal the patch to the roof.