5. Missing Granules
Granules help protect the shingles from being damaged by the UV rays emitted by the sun. If you notice dark patches of light shingles or lighter patches on darker shingles this is a sign of missing granules. You may also find them in the gutters when cleaning them. Missing granules are not harmful and do not affect the waterproofing of your roof. However, the more loss of granules means that the shingles are wearing faster, and the level of water protection will continue to decrease over time.
6. Roof is Covered in Moss
Although this is not a health hazard it is an aesthetic one. If you don’t mind the look, then there is no need to replace your roof. If you decide to take matters into your own hands and wash the moss off, you can do so by mixing one-part bleach and one-part water. It’s important to be gentle because you do not want to damage any of the shingles.
7. Roof is Sagging
A sagging roof is no joke and must be taken seriously. This can be a sign of structural issues or damage to the plywood. At this point, you should contact your roofer as soon as possible to prevent any extreme damages.