Start with what the building sits on. A gravel pad drains naturally. Concrete blocks keep the structure elevated with airflow underneath. Both prevent moisture from sitting against the floor.
Beyond that, make sure the ground around the building slopes gently away on all sides. Even a slight grade pushes water in the right direction. If you're in a naturally wet area, extending the gravel pad a bit wider or adding a simple drainage channel can make a big difference.
The pressure-treated floor has a lifetime warranty against termites and decay, so it's built to handle moisture contact. But helping water move away from the building means everything lasts longer and stays in better shape.
