Final answer:
The dam is used on window flashing to prevent water leakage, enhance insulation, increase structural stability, and improve aesthetics.
Step-by-step explanation:
The dam is used on window flashing to prevent water leakage. Window flashing is a material that is installed around windows to prevent water from entering the building. The dam is a crucial part of the flashing system as it acts as a barrier that prevents water from seeping into the window frame and causing damage.
The dam creates a seal that forces water to flow away from the window and down the sides of the building. This helps enhance insulation by preventing water from penetrating the window and affecting the temperature inside the building. It also increases structural stability by protecting the window frame and wall from potential water damage.
While the main purpose of the dam on window flashing is to prevent water leakage, it may also have a secondary benefit of improving aesthetics. By effectively sealing the window, the dam ensures that the exterior appearance of the building is not compromised by water stains or damage.