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An ice shield of underlayment must extend from the eave's edge to how many inches inside the exterior wall line?

  1. 24

  2. 36

  3. 18

  4. 48

The correct answer is: 24

The requirement for an ice shield of underlayment to extend from the eave's edge is primarily aimed at preventing water intrusion and ice dam formation, which can lead to significant damage in colder climates. In many building codes, it is specified that the ice shield should extend a minimum of 24 inches inside the exterior wall line. This provision ensures that the most vulnerable areas, where melting snow could potentially refreeze and create ice dams, are adequately protected. Extending the ice shield this distance helps to mitigate the effects of ice and snow accumulation, allowing for proper drainage and reducing the likelihood of leaks or water damage within the building. This standard is crucial for maintaining the integrity of the roof and the overall structure, especially in regions prone to heavy snowfall and ice build-up during winter months. The other options suggest further distances, which can be more than necessary based on typical code requirements, and adhering to the specified minimum is considered sufficient for comprehensive protection in most construction scenarios.