How far should floor joists be from the ground?

The minimum distance that floor joists should be above the ground is typically 18 inches, as indicated in the North Carolina Residential Code. This distance is crucial for several reasons. First, it helps to prevent moisture from the ground from coming into contact with the wood, which can lead to rot and other forms of deterioration. Additionally, maintaining this height allows for better air circulation underneath the floor, which is essential for drying out any moisture that may accumulate, thereby reducing the risk of mold growth.

So, having the floor joists positioned at least 18 inches above the ground serves to enhance the structural integrity and longevity of the building while ensuring compliance with safety and building standards.