Curling shingles are a sign of weathering and indicate a roof needs to be replaced within a few years. Shingles that are beginning to curl will eventually break and cause roof leaks, so it’s best to have the issue addressed sooner rather than later. The main reason that shingles start to curl is insufficient attic ventilation. If your attic is not ventilated properly, excess moisture has nowhere to escape. This trapped heat and humidity will cause damage and mold. Shingles being layered on other old shingles that were in very poor shape will also cause curling. Since the second layer of shingles was placed on weak shingles, they are more easily penetrated by wind and moisture. Additionally, improper roof installation, such as a lack of nails to hold down the shingles or misaligned shingles, can also cause curling.
The two types of curling to watch out for are cupping and clawing. Cupping is when the edges turn upward. Clawing is when the middle starts to come up while the edges remain flat. Cupping is most commonly due to old age. It’s important to replace shingles that are cupping and not layer new shingles on top of them as this can cause future damage to your roof. Clawing is most commonly due to excessive heat from the attic. Clawing is detrimental to your roof because over time the middle of the shingles that are clawing can trap rain water and allow it to soak into the shingles. This will cause roof deterioration. Knockout Roofing can swiftly find the source of the curling shingles and remediate before any more damage is done to your home.