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The minimum clearance required between wood siding and earth on the exterior of a building is 6 inches. This guideline is established to prevent moisture intrusion and deterioration of the wooden materials. When wood siding is in direct contact with the ground, it is exposed to constant moisture, which can lead to rot, mold growth, and pest infestation. Maintaining a clearance of 6 inches helps to ensure proper ventilation and allows for air circulation that aids in drying any moisture that may accumulate on the siding. This practice also protects the structural integrity of the building and extends the longevity of the wood siding.

In certain building scenarios, approved materials may not require the same clearance, as they are designed to resist moisture and decay more effectively than untreated wood. By adhering to this clearance requirement, builders and homeowners can help ensure their properties are better protected against environmental factors that contribute to deterioration over time.