The answer to 'what causes gutter guards' is that gutter guards are installed on gutters to help prevent debris like leaves, twigs, and pine needles from clogging the gutters. Gutter guards work by covering the top of the gutter with a mesh or screen material that allows water to flow through while keeping out larger debris. This helps maintain proper drainage and prevents the gutters from getting blocked up.
Gutter guards are a common solution for homeowners who want to reduce the frequency of gutter cleaning and maintenance. They can be made from various materials like plastic, metal, or foam, and come in different styles to fit different gutter systems. Installing gutter guards can be a DIY project, but it's often recommended to have a professional roofer or gutter specialist install them to ensure proper fit and function.