The answer to 'gutters curling' is that gutters can curl due to a few common causes. This typically happens when the gutters are not properly installed or maintained, leading to warping and deformation over time. Symptoms include the edges of the gutters pulling away from the roof and the overall shape becoming wavy or uneven.
The main causes of gutter curling are exposure to the elements, poor installation, and a lack of regular cleaning and maintenance. Gutters that are not securely attached to the roof or that have accumulated debris and buildup are more prone to curling. This can allow water to leak behind the gutters, leading to further damage.