Answer :

Final answer:

Flashing is used in construction to prevent water leakage in a building. Exterior flashing is usually seen around doors, windows, and roofs, while interior flashing is concealed within walls or around installations like pipes and outlets. They both serve the same function but are applied in different areas of a building.

Explanation:

The question seems to be a bit confused because exterior flashing and interior flashing aren't differentiated in terms of their functionality in the construction industry. Flashing, in general, is a thin sheet of material used to prevent water penetration into the structure of a building. Both exterior and interior flashings serve this function, but they are applied in different parts of a building.

Exterior flashing is commonly seen around doors, windows, and roofs where it helps to guide water away from the joints and from seeping into the interior of the structure. It plays a critical role in minimizing the risk of water leakage that can cause significant damage over time.

Interior flashing, on the other hand, tends to be used within the structure of the building, often concealed within walls or around installations such as pipes and electrical outlets. Its main function is to prevent condensation or leakage within these areas, which could lead to problems like mold or electrical issues.

Throughout the text, you have an example related with structure and heat transfer of a wall, but not really related with flashing. This example has to do with insulation, not flashing.

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