Installing aluminum sheets on a roof involves several key steps: 1) Inspect the roof structure to ensure it can support the new material. 2) Remove any existing roofing material. 3) Install roof underlayment to protect against moisture. 4) Position the first aluminum sheet at the lowest point of the roof, aligning it with the eaves. 5) Secure the sheet using clips or screws, ensuring a watertight seal. 6) Continue installing sheets up the roof, overlapping each by at least 2 inches for a secure fit. 7) Cut and fit sheets around vents, pipes, and other roof protrusions. 8) Install flashing and trim to finish edges and seal the roof. 9) Check for proper alignment and secure all fasteners. 10) Clean up debris and inspect the installation for any gaps or leaks.