What is the purpose of flashing in construction?

Flashing in construction serves the essential purpose of protecting structures from water intrusion. It is a material, often made of metal or a water-resistant membrane, that is installed at points where different building elements meet, such as around windows, doors, chimneys, and roofs. Its design allows it to direct water away from these vulnerable areas, preventing leaks that can lead to water damage, mold growth, and structural issues over time. By creating a waterproof barrier, flashing is critical in maintaining the longevity and integrity of a building, ensuring that rainwater or other sources of moisture do not penetrate into the interior spaces. The proper installation of flashing is vital in various construction applications, emphasizing its role as a protective measure against the elements, particularly water.