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To prevent moisture intrusion behind the sidewall flashing, _____ -flashing should be installed at brick and stone walls.

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Final answer:

Counter-flashing should be installed at brick and stone walls to prevent moisture intrusion behind the sidewall flashing. It is installed on top of the base flashing and provides a barrier against water intrusion.

Step-by-step explanation:

To prevent moisture intrusion behind the sidewall flashing, counter-flashing should be installed at brick and stone walls.

Counter-flashing is a technique used in construction to prevent water from entering the wall at the point where the flashing is installed.

It is installed on top of the base flashing and provides a barrier against water intrusion.

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