Answer :

Final answer:

New metal counter flashing should be installed on a chimney when the existing flashing is damaged or deteriorating. It helps prevent water damage and maintain the integrity of the chimney.

Explanation:

New metal counter flashing should be installed on a chimney when the existing flashing is damaged or deteriorating. Counter flashing helps to prevent water from entering the chimney and causing damage. It is important to regularly inspect the flashing and replace it if necessary to maintain the integrity of the chimney.

For example, if the existing flashing is rusted or missing, it needs to be replaced with new metal counter flashing. Another example is if water is entering the chimney through gaps in the flashing, new counter flashing should be installed to properly seal the chimney.

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