How do I ensure that the joints between aluminum sheets are secure and watertight?

To ensure that the joints between aluminum sheets are secure and watertight, use a combination of sealants and appropriate fasteners. First, clean the surfaces to be joined thoroughly. Apply a high-quality, waterproof sealant along the joint. This sealant should be compatible with aluminum and resistant to UV, temperature changes, and water. Then, use corrosion-resistant fasteners such as stainless steel screws or rivets to join the sheets. Ensure that the fasteners are tightened correctly to prevent leaks. Additionally, consider using a gasket or a weatherstrip along the joint for added watertightness. Regularly inspect and maintain the joints to ensure ongoing watertight integrity.