California Residential Inspector Practice Exam

When using wood columns in crawl spaces, what is the minimum projection above the earth required if not treated?

1. 6 inches

2. 8 inches

3. 10 inches

4. 12 inches

The correct answer is: 8 inches

The minimum projection above the earth required for untreated wood columns in crawl spaces is 8 inches. This requirement is established to protect the wood from direct contact with soil, which can lead to moisture retention and eventual decay. By ensuring that the wood columns extend at least 8 inches above the ground level, it helps to minimize the risk of insect infestation and fungal growth. This standard is particularly crucial in maintaining the structural integrity of wood components exposed to the possibly damp environment of crawl spaces. The rationale behind this specific height is grounded in building codes and standards aimed at enhancing durability and safety in construction practices. In essence, this 8-inch clearance serves as a preventative measure, allowing for ventilation and drainage, thereby contributing to the longevity of the wood columns that are crucial for supporting structural loads.