What is the clearance requirement for untreated exterior wood siding from finish grade?

The clearance requirement for untreated exterior wood siding from finish grade is crucial for ensuring the longevity and integrity of the siding material. This requirement is set to prevent moisture accumulation and subsequent deterioration of the wood.

By maintaining a clearance of 8 inches from the finish grade, the wood siding is protected from direct contact with soil, which can harbor moisture and pests. This distance is a recognized standard in building codes aimed at minimizing the risk of rot, mold, and damage caused by insects.

Such a precaution is especially important for untreated wood, which is more vulnerable to environmental factors than treated wood that has been chemically protected. The 8-inch clearance acts as a buffer, allowing airflow around the siding and reducing the likelihood of water intrusion, thereby extending the lifespan of the siding and maintaining the overall health of the building's structure.