A wall cap is a protective cover that is installed at the top of an exterior wall to help prevent the entry of rainwater, debris, and other potential contaminants into the building. These caps are typically made from a durable, weather-resistant material such as Galvanized or Galvalume metal, and they can come in a range of different shapes and sizes to accommodate the specific needs of the building. The primary purpose of a wall cap is to provide a barrier against moisture and other potential sources of damage to the building's exterior walls. Without a proper wall cap, rainwater can collect on the top of the wall and seep into the building, potentially causing a range of problems including water damage, mold growth, and structural issues.