Counter flashing is a vital element in roofing systems, designed to prevent water from penetrating the area where a roof meets a wall or chimney. It's typically made of metal, such as galvanized steel, and is installed in a way that overlaps the base flashing and extends up the wall.  


Key Features of 150g Counter Flashing:
Weight: The 150g designation refers to the weight per square meter of the material. This weight provides a balance between durability and flexibility.
Material: Typically made of galvanized steel, offering corrosion resistance and longevity.
Size: Available in various lengths and widths to suit different roofing applications.
Installation: It's usually installed in conjunction with base flashing, ensuring a watertight seal.  
Purpose: Prevents water from entering the building through the vulnerable junction between the roof and wall.