What is the minimum height that exterior wood must be above ground?

The minimum height that exterior wood must be above ground is 6 inches. This requirement is established to help prevent moisture-related issues, such as rot and decay, which can significantly weaken the structural integrity of wood over time. When wood is in direct contact with the ground, it is more susceptible to water infiltration, pests, and fungal growth.

By ensuring that exterior wood elements, like deck posts or sill plates, are elevated above ground level, you create a barrier that reduces direct exposure to soil moisture. This elevation also aids in ventilation and drainage around the wood, contributing to a longer lifespan for the materials used in construction.

Keeping the height at 6 inches is a commonly accepted standard in building codes to provide adequate protection against these risks, making it an essential guideline for anyone involved in construction or inspection of exterior wood structures.