The answer to 'how often to replace roof decking' is that roof decking typically lasts 20-50 years, depending on the material and climate. Plywood or OSB roof decking is the most common, and it usually needs to be replaced every 20-30 years. Solid wood roof decking can last 30-50 years with proper maintenance. The key is to inspect the decking regularly and replace it before it becomes damaged or unsafe.
Roof decking is the structural base that the roofing material is installed on, so it's important to keep it in good condition. Signs that the decking needs to be replaced include sagging, crumbling, or rotting boards. Homeowners should also check for water damage, mold, or insect infestation, which can compromise the integrity of the decking. Calling a professional roofing contractor is recommended for any major roof decking repairs or replacement.