Oregon Construction Contractors (CCB) Practice Test

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What could happen if different metals are mixed in flashing?

Improved durability
Increased corrosion risk
No effect
Reduction in material costs

The correct answer is: Increased corrosion risk

When different metals are mixed in flashing, the most notable concern is the increased corrosion risk. This occurs because of galvanic corrosion, which happens when two dissimilar metals are in contact with each other in the presence of moisture or an electrolyte. In such environments, the more reactive metal (anode) can corrode more quickly, leading to a breakdown of the materials over time. For instance, if aluminum is used alongside copper in flashing, the aluminum can deteriorate preferentially, resulting in structural issues over time. This type of corrosion can compromise the effectiveness of the flashing and lead to leaks and water intrusion. Therefore, it's critical to choose compatible materials to ensure the longevity and integrity of flashing systems.