What is the minimum distance untreated wood joists should be installed from the ground?

The minimum distance that untreated wood joists should be installed from the ground is 18 inches. This guideline is crucial in residential construction to minimize the risk of moisture damage and insect infestation. When wood is placed too close to the ground, it is exposed to moisture and dampness, which can lead to decay and create an environment conducive to termites and other pests.

The 18-inch standard is set to ensure that there is adequate ventilation and air circulation underneath the structure, which helps to keep the wood dry. Additionally, maintaining this distance helps comply with building codes that aim to promote safety and longevity in construction practices.

While the other distances listed might seem reasonable, they do not align with this specific building code requirement aimed at protecting untreated wood materials in a residential setting.