Signature Rain Gutter & Metal Works by Simmitri Sunnyvale 100 S Murphy Ave. Ste 200, Sunnyvale, CA 94085 San Jose 6203 San Ignacio Ave. Ste 110, San Jose, CA 95119 The best rain gutter guards for intense rainfall can prevent excess rain from adding weight to your gutters. They will also prevent water from flowing down the side of your home. You can trust any of the rain gutter guards on this list for your needs. But the best rain gutter guard to consider, in our opinion, is the Leaf Filter Guard system ... K style gutters, half round gutters and OG style gutters, for example, come in 4 inches, 5 inches and 6 inches. We work with the facia profile, box style profile, round downspouts, square corrugated downspouts, square smooth finish downspouts, rain chains, rain barrels, leaf screens, the collector box and more.