How many inches must wood columns project above the earth when supported by concrete piers?

In California residential construction, when wood columns are supported by concrete piers, it is crucial to ensure that the wood does not come into direct contact with soil. This is to prevent moisture absorption, which can lead to decay and significantly reduce the lifespan of the wood. As per the applicable building codes, wood columns must project a minimum of 6 inches above the earth. This height creates a barrier to moisture from the ground while also providing necessary ventilation. It promotes durability and adherence to safety standards in construction practices. Therefore, selecting 6 inches as the height ensures compliance with these standards and contributes to the overall integrity of the structural system.