If the water overflows the gutter and pours along your foundation, you definitely have a problem. Usually caused by gutter clogs, it prevents rainwater from flowing smoothly. Overflowing gutters can lead to several other problems that reduce the lifespan of your gutters.Mesh guards are similar to screens, but the holes are smaller. With an average cost of $4 to $10 per linear foot, they offer better protection against pine needles and other debris. However, dirt and pollen can still get through in some cases. The overall durability depends on the materials used, but most mesh guards last 8 to 18 years. They work great in areas with high rainfalls and storms, especially if you have a lot of pine needles or pollen in the air.