The answer to 'why is my roof decking damaged' is that there are several common causes, including water damage, age and wear, and improper installation. Roof decking is the structural layer beneath the shingles or other roofing material, and it can become damaged over time due to exposure to the elements, poor ventilation, or other factors.
Some common symptoms of damaged roof decking include sagging, soft or spongy spots, and visible cracks or holes. If left unaddressed, damaged decking can lead to further problems like leaks, mold, and even structural issues with the roof. In some cases, the entire roof may need to be replaced if the decking is severely compromised.