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The maximum allowed exposure to the weather for wood shingles, particularly those made from naturally durable wood, is critical for maintaining the shingle's effectiveness in protecting the structure while preventing water infiltration. The correct exposure of 3 ¾ inches aligns with the established building codes that specify how much of the shingle can be left exposed to the elements when installed on a sloped roof of 3:12. This dimension helps ensure that shingles properly overlap, thereby reducing the risk of water penetration and potential damage to the underlying roof structure.

In this context, the 3 ¾-inch exposure is a compromise that allows for adequate drainage while still providing a robust weather barrier. This exposure ensures that the shingles can function effectively against various weather conditions without excessive wear due to exposure, which could lead to premature failure.

Other options, although appealing for different situations or materials, do not meet the standard requirements for this specific application and roof slope, making 3 ¾ inches the appropriate and code-compliant choice.