Chicago's proximity to Lake Michigan creates unique challenges for skylights. Lake effect moisture keeps relative humidity higher than in inland cities, particularly during spring and fall. This moisture accelerates sealant degradation and metal flashing corrosion. Our winter freeze-thaw cycles are more frequent and severe than in other northern cities. A skylight might experience 40 to 50 freeze-thaw events between November and March. Each cycle stresses the flashing connections and sealant bonds. Wind-driven rain from lake storms hits skylights at angles that bypass inadequate flashing details. These factors make properly installed, multi-layer flashing systems essential for Chicago skylights.
Chicago's building inspectors enforce strict standards for roof penetration flashing because they understand our climate demands better protection than code minimums. We work with inspectors across Cook County regularly and understand their expectations. Our flashing installations exceed minimum code requirements because we have seen what fails in Chicago conditions. When you hire us, you get a crew that has repaired hundreds of skylight leaks throughout the Chicago metro. We know which skylight brands hold up best, which flashing details work in our climate, and which shortcuts lead to repeat failures. That local experience protects your investment.
