Dual-layer gutter guards really do outperform the single-layer type There are more than 200 different gutter guards on the North American market alone, and that’s not counting the hundreds of registered patents for rainwater management systems. Inventors and manufacturers have gone to great lengths to turn out the best possible gutter guards at reasonable prices, but homeowners remain unimpressed. Understandably so, since their gutters keep on clogging—often, it’s the gutter...