The answer to 'why is my roof sagging' is that a sagging roof is often caused by structural issues, such as weak or damaged roof framing or supports. This can be due to factors like age, water damage, poor construction, or excessive weight from things like heavy snowfall.
Some common symptoms of a sagging roof include visible dips or depressions in the roofline, cracks in the ceiling or walls, and doors and windows that are no longer properly aligned. If left unaddressed, a sagging roof can lead to more serious structural problems and potential collapse.
In some cases, minor sagging may be fixable with DIY repairs, such as reinforcing the roof framing or replacing damaged beams. However, significant sagging or structural issues usually require the expertise of a professional roofing contractor to properly assess the problem and make the necessary repairs. Attempting major roof repairs without the proper skills and equipment can be dangerous, so it's best to call in a pro if you suspect your roof is seriously compromised.