The answer to 'how long does roof decking last' is that roof decking can typically last 20-50 years, depending on the material and installation. Roof decking is the structural base layer that supports the roofing materials and provides a stable foundation for the roof. It's usually made from plywood, oriented strand board (OSB), or solid wood boards.
Properly installed and maintained roof decking can last for decades. Plywood and OSB decking often last 20-30 years, while solid wood boards may last 40-50 years. However, factors like climate, roof ventilation, and exposure to moisture can impact the lifespan. Regular inspections and prompt repairs to any damage are key to maximizing the life of your roof decking.