Oregon Construction Contractors (CCB) Practice Test

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What is the effect of pressure-treated wood on aluminum and galvanized flashing?

It enhances durability
It should not be in direct contact
It improves electrical conductivity
It prevents corrosion

The correct answer is: It should not be in direct contact

Pressure-treated wood contains chemicals designed to protect it from rot and insect damage. However, these chemicals can be corrosive to metals, including both aluminum and galvanized flashing. When pressure-treated wood is in direct contact with these metals, it can lead to accelerated corrosion and degradation of the metal flashing over time. To prevent this damaging interaction, it is crucial to ensure that there is a barrier between pressure-treated wood and metal flashing. This principle helps maintain the structural integrity of the flashing and extends its lifespan, preventing costly repairs or replacements due to corrosion. Other options like enhancing durability or improving electrical conductivity do not accurately reflect the relationship between pressure-treated wood and the metals in question and do not address the potential corrosion issue. Preventing corrosion is the primary objective when considering the relationship between pressure-treated wood and aluminum or galvanized materials.