What is the minimum recommended distance that a deck should be above the soil for adequate ventilation?

The recommended minimum distance for a deck to be above the soil for adequate ventilation is 18 inches. This clearance allows for sufficient airflow underneath the deck, which helps to prevent moisture buildup and reduce the risk of rot, mold, and decay in the deck structure and supports.

Maintaining an 18-inch space ensures that air can circulate freely, which is essential for keeping the materials dry and prolonging the lifespan of the deck. This height also sets a balance between providing necessary ventilation and ensuring that the deck remains structurally sound and user-friendly. A height lower than this could restrict airflow and lead to damp conditions, while a greater height might be more than necessary for ventilation purposes, possibly raising construction costs without significant benefits.