Why every Evanston home should have 6-inch gutters and oversized downspouts.
Evanston's tree canopy in numbers
Evanston has roughly 35,000 public-right-of-way trees and an estimated 80,000 private trees. The canopy coverage on most residential blocks ranges from 35% to 55%. The result on roofs and gutters: continuous organic debris ten months a year.
Why standard 5-inch gutters fail here
Standard 5-inch K-style gutters were designed for sun-baked subdivision streets, not for Evanston. They overflow during heavy spring rains because the downspouts clog with leaves, they sag from organic debris weight, and they ice-dam in winter when the debris freezes solid.
Our standard Evanston spec
6-inch K-style gutters in 0.032-gauge aluminum (never 0.027 builder-grade), hidden hangers every 24 inches with stainless screws, 3x4-inch oversized downspouts on every drop point, and stainless micro-mesh guards. For homes under heavy oak or honey locust cover we upsize to 4x5 downspouts.
Gutter guards: which ones actually work
Micro-mesh stainless (LeafFilter-style and equivalents) works. Foam inserts do not — they clog and ice up. Slatted reverse-curve guards (Gutter Helmet style) work in low-debris settings and fail under heavy Evanston tree cover. We install stainless micro-mesh exclusively, with a 10-year written clog-free warranty.
Maintenance schedule
Twice yearly even with guards — late spring after maple seed pods drop, late fall after leaf drop. A 30-minute rinse from a garden hose at the downspout opening prevents 90% of mid-winter ice-dam events.