The answer to 'flashing vs' is that flashing and caulking are both important for sealing and protecting roof edges, but they serve different purposes and have different application methods. Flashing is a thin, durable metal or plastic material that is installed around roof penetrations, edges, and joints to prevent water leaks. Caulking is a flexible sealant that is applied to fill gaps and cracks to prevent water intrusion. Flashing is a more permanent solution, while caulking may need to be reapplied periodically as it can degrade over time.
Flashing is typically made of aluminum, galvanized steel, or copper and is installed during the roof installation process. It is shaped to fit around roof features like chimneys, vents, and skylights to create a watertight seal. Caulking, on the other hand, is a flexible sealant that can be applied to existing roofs to fill gaps and cracks. It is a more temporary solution that may need to be reapplied every few years as it can dry out and crack over time.