The answer to 'cost to replace roof decking' is that the cost can vary significantly depending on several factors. Typically, replacing roof decking can range from a few hundred dollars to several thousand dollars, depending on the size of the roof, the extent of the damage, and the complexity of the project.
Some key factors that influence the cost of replacing roof decking include the size of the roof, the type of decking material (e.g., plywood, OSB, or boards), the accessibility of the roof, the need for any structural repairs, and the labor costs in your local area. It's important to get quotes from multiple local roofing contractors to get an accurate estimate for your specific project.