Gutters Code Requirements in Illinois

State with significant severe hail frequency per NOAA SPC storm reports. Insurance restoration contractors should document pre-existing hail damage and recommend impact-resistant materials.

Local floodplain ordinance compliance required for construction in FEMA-designated flood zones. Illinois has extensive river valley flooding (Mississippi, Illinois, Ohio, Wabash, Fox, Des Plaines). Local communities administer floodplain regulations.

The Illinois Radon Awareness Act (420 ILCS 46) requires disclosure of radon hazards in real estate transactions statewide. Sellers must provide the Illinois Disclosure of Information on Radon Hazards form to buyers. This applies regardless of EPA zone designation.

EPA-designated Radon Zone 1 counties (highest priority). Predicted average indoor radon screening levels greater than 4 pCi/L. Covers most of northern and central Illinois including Cook, DuPage, Lake, Will, Kane, McHenry, Winnebago, Peoria, Champaign, Sangamon, McLean, and 48 other counties. Radon-resistant new construction (RRNC) strongly recommended.

EPA-designated Radon Zone 2 counties (moderate priority). Predicted average indoor radon screening levels between 2-4 pCi/L. Covers most of southern Illinois including Madison, St. Clair, Monroe, Randolph, Perry, Jackson, Williamson, Saline, Gallatin, White, Hamilton, Wayne, Edwards, Wabash, and others. Radon testing recommended for all homes.

EPA-designated Radon Zone 3 counties (lowest priority). Predicted average indoor radon screening levels less than 2 pCi/L. Covers southernmost Illinois including Alexander, Pulaski, Massac, Pope, Hardin, Johnson, Union counties. Radon testing still recommended as any home can have elevated radon.

State and federal historic districts in Illinois. Illinois Historic Preservation Agency (IHPA) serves as State Historic Preservation Office (SHPO). Review required for projects with state or federal involvement in historic properties. Local historic preservation commissions may have additional requirements.

Ice barrier required statewide for ALL roofing projects in Illinois per IRC R905.1.2 (where IRC is adopted). All of Illinois is in Climate Zones 4A or 5A, which require ice barrier underlayment. Must extend minimum 24 inches inside exterior wall line. Required at eaves, valleys, and around penetrations.

State within or adjacent to the tornado corridor. NOAA SPC data confirms significant tornado frequency. Enhanced structural requirements apply per IRC R301.2.1.2.