The answer to 'when to replace roof decking' is that you should consider replacing your roof decking if it shows signs of significant damage or deterioration. Roof decking, which is the structural layer beneath your roof shingles, plays a critical role in the integrity and longevity of your roof. Over time, factors like water damage, rot, or structural issues can compromise the decking, making it necessary to replace it.
Some common signs that your roof decking may need replacement include visible sagging, soft or spongy areas, and excessive wear or damage. If you notice these issues, it's best to have a professional roofing contractor inspect your roof and provide an assessment. They can determine the extent of the damage and whether a full deck replacement is necessary.