Metal flashing is designed to protect buildings from water infiltration and moisture damage. Its primary function is to redirect water away from critical areas, such as roof joints and chimneys, where water can enter and cause structural damage. Therefore, metal flashing must be corrosion-resistant to withstand the elements over time, for instance, the effects of rain, snow, and ice. Corrosion can compromise the integrity of the flashing and lead to failure in its protective role.
In addition to its corrosion resistance, the flashing must effectively prevent moisture entry, which is crucial in maintaining the integrity of the building envelope. If moisture seeps through due to improperly installed or degraded flashing, it can cause significant issues, including mold growth, wood rot, and deterioration of structural components.
The focus on corrosion resistance and the prevention of moisture entry highlights the importance of selecting appropriate materials and installation techniques for flashing to ensure long-lasting protection for a structure.