Sidewall flashing is a vital component in roofing systems, designed to prevent water from penetrating the area where the roof meets a vertical wall. This typically occurs at gable ends, chimneys, or other structures that intersect with the roof.

Key Features and Functions:
Waterproofing: Prevents water from seeping between the roof and wall, reducing the risk of leaks and damage. 
Durability: Made from materials like metal or PVC, ensuring long-lasting performance. 
Customization: Available in various sizes and profiles to fit different roofing and wall types. 
Aesthetics: Can be designed to match the overall appearance of the roof and building.