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The correct answer stems from the requirements for flashings and copings in construction, which need to ensure durability and resistance to water infiltration. No. 26 galvanized sheeting is a specification that balances strength and weight, providing adequate protection against the elements while remaining manageable for installation.

Galvanized sheeting is commonly used in these applications due to its corrosion-resistant properties, which prolong the service life of the flashing or coping. Using No. 26 galvanized sheeting ensures that these components can withstand not only wind and rain but also the wear and tear from environmental factors over time, leading to structural integrity and maintenance efficiency.

The other options represent thicknesses that would either not provide the necessary durability (in the case of No. 28 or No. 30) or may be excessively heavy and cumbersome for typical installations (if referring to No. 24). Thus, No. 26 strikes an ideal balance between functionality and practicality for exterior wall applications.