The answer to 'fascia sagging' is that the fascia board, which runs along the edge of the roof, is sagging or pulling away from the roofline. This is a common issue that can be caused by a few different factors, such as water damage, poor installation, or simply age and wear over time.
Some common symptoms of fascia sagging include gaps between the fascia and the roof, the fascia appearing wavy or uneven, and water damage or rot on the fascia board itself. If left unaddressed, sagging fascia can lead to further roof damage and even leaks. In many cases, fascia sagging is a problem that should be addressed by a professional roofing contractor, as it may require replacement of the fascia board or other structural repairs.