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Chicago — Tier-1 Pillar

Chicago Roofing — IL Roofing Contractor Act, Flat Roof, Ice-Dam Mitigation

Chicago roofing reality. Illinois Roofing Industry Licensing Act mandatory (Class A misdemeanor if unlicensed), flat roofs on 3-flats and walkups (EPDM, modified bitumen, TPO), ice-dam mitigation with ice-water shield, tuckpointing integration on brick parapets. $12K-$85K typical.

~1 min read·Updated 2026-04-23

Illinois is one of the few states with mandatory state-level roofing contractor licensing. The Illinois Roofing Industry Licensing Act requires every roofing contractor to hold an IDFPR-issued license (prefix "105-"). Unlicensed roofing is a Class A misdemeanor. Chicago's housing stock splits between pitch-roofed single-family and flat-roofed 2-flats, 3-flats, and walkups. Ice-dam mitigation (Grace Ice & Water Shield to 24" inside heated wall) is code-required on pitched roofs.

AskBaily routes Chicago roofing to one IL Roofing Contractor Act licensed contractor with tuckpointing-adjacent experience — critical on brick parapet walls.

Frequently asked questions

Do I need an IL roofing license to work in Chicago? Yes — Illinois Roofing Industry Licensing Act requires state license for any roofing work. Verify at idfpr.illinois.gov before signing.

What is ice-dam mitigation? Grace Ice & Water Shield (or equivalent) installed from eaves to 24" inside the heated wall, plus ventilation balance to prevent freeze-thaw-driven ice dams. Code-required on Chicago pitched roofs.

How much does a Chicago re-roof cost? Asphalt shingle pitched 2500 sqft: $12K-$22K. Flat roof 2-flat EPDM: $14K-$28K. Modified bitumen 3-flat: $18K-$42K. Tile or metal premium: $35K-$85K.

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Baily is named after Francis Baily — an English stockbroker who retired at 51, became an astronomer, and in 1836 described something on the edge of a solar eclipse that nobody had properly articulated before: a string of bright beads of sunlight breaking through the valleys along the moon’s rim.

He wasn’t the first to see them. Edmond Halley saw them in 1715 and barely noticed. Baily’s contribution was clarity — describing exactly what was happening, in plain language, so vividly that the whole field of astronomy paid attention. The phenomenon is still called Baily’s beads.

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