The answer to 'how to repair flashing' is to properly seal and secure any damaged or loose flashing around your roof. Flashing is the thin metal or plastic material used to prevent water leaks at roof joints, edges, and penetrations. Over time, flashing can become cracked, rusted, or detached, allowing water to seep into your home and cause damage.
To repair flashing, first locate the damaged areas. Clean the surface with a wire brush to remove any rust or debris. Apply a high-quality roofing sealant or caulk to fill in cracks and gaps. If the flashing is loose, use roofing nails or screws to re-secure it to the roof. For more extensive damage, you may need to replace the flashing entirely.