Metal flashing should be resistant to which element to prevent moisture entry?

Metal flashing is used in construction to direct water away from critical areas of the building, such as joints, edges, and areas where roofing meets walls. One of the most significant threats to the integrity of metal flashing is corrosion. Corrosion can occur when metal comes into contact with moisture and is often exacerbated by environmental factors such as salt, chemicals, and other corrosive agents. If the flashing corrodes, it can develop holes or weakened areas that allow moisture to penetrate into the building, leading to potential water damage, mold growth, or structural issues.

Selecting a flashing material that is resistant to corrosion ensures that it maintains its protective qualities over time, effectively preventing moisture entry and safeguarding the building's envelope. This is crucial in maintaining a dry and structurally sound environment.