The answer to 'roof decking damaged' is that the roof decking, which is the structural base layer under the shingles or other roofing material, can become damaged for several reasons. Common causes include water damage from leaks, structural issues like sagging or warping, and deterioration over time. Symptoms may include visible cracks, holes, or rotting in the decking material.
If the damage is minor, such as a small crack or hole, it may be possible to repair the decking yourself. However, for more extensive damage or if the structural integrity of the roof is compromised, it's best to call in a professional roofing contractor to assess the situation and make the necessary repairs. Attempting major roof decking repairs without the proper expertise and equipment can be dangerous and lead to further damage.