Skip to main content

Corrosion


On a roof with copper flashing secured by galvanized steel nails, which metal will corrode the more anodic metal over time as the roof is exposed to rain water?

A. copper flashing
B. galvanized nails
C. neither, the metals are not dissimilar
D. both will equally corrode in contact

AnswerA. copper flashing, more noble and cathodic, will corrode the galvanized nails as electrolytic rainwater is introduced. Contact between 2 metals at different ends of the galvanic scale should be avoided, or non-conductive coatings or materials could separate them.
ARE 4.0 exam prep: BDCS

Resource tip: Read about galvanic action at archtoolbox.com

Comments

Post a Comment

Try These Too!

Bidding process

If the Owner would like to change the designated bid opening date and time contained in the Instructions to Bidders for the Owner's convenience, what procedure must be used? Answer
Post a Comment
See the answer »

Fire evacuation

Which of the following statements best describes why exterior fire escapes are no longer recommended or usually permitted? A. Manufacturing has ceased production of these. B. Rising smoke from lower floors eliminates the safety of using them C. They cannot be securely attached to typical current construction D. They are difficult to maintain Answer B. is the correct answer. Smoke inhalation is as perilous as leaping flames. ARE 4.0 exam prep: BS
Post a Comment
See the answer »

Risk management

How does an owner provide a financial safeguard for the following situations: - unanticipated price escalation of a particular product - an architect’s omission of flashing in the construction documents - a necessary change during construction, modifying the project’s scope. A. Allowance B. Alternates C. Contingency D. Escalation Answer C. Contingency is an amount, usually a percentage, that is part of the project budget to offset changes in the scope of the project, unknown conditions, and gaps/oversights in the documents. ARE 4.0 exam prep: PPP
Post a Comment
See the answer »