What is window flashing and how does it contribute to the overall integrity and performance of a building's envelope?

Window flashing is a thin, waterproof material installed around Windows to prevent water from seeping into the building. It helps maintain the integrity of the building's envelope by directing water away from vulnerable areas, reducing the risk of water damage, mold growth, and structural issues. Properly installed window flashing is crucial for ensuring the overall performance and longevity of a building.