What are the common causes of deck rot and how can it be prevented or treated effectively?

Common causes of deck rot include exposure to moisture, lack of proper ventilation, and use of untreated wood. To prevent deck rot, it is important to regularly inspect and maintain the deck, ensure proper drainage, use pressure-treated or rot-resistant wood, and apply a waterproof sealant. If deck rot is already present, it can be treated by replacing the affected wood, reinforcing structural supports, and applying wood preservatives.