Commercial Flat Roofing Across Cook County

The Oldest Commercial Roofscape in the Region

Suburban Cook County is where Chicagoland’s commercial building stock is oldest, densest, and most layered, in every sense. The industrial belt around O’Hare, the manufacturing corridors of the inner western suburbs, the Clearing district by Midway, the Cal-Sag industrial strip on the south end, and the enormous retail and office mass of the northwest suburbs all sit in Cook. Most of it was built between the 1950s and the 1980s, which means most of it is on its second or third roof right now, and a lot of those roofs are recovers laid over problems instead of solutions to them.

That’s the recurring Cook County story on our assessments: a membrane that looks passable from the hatch, sitting on wet insulation and a deck that’s been through 50-plus freeze-thaw seasons. Code allows two roof layers, and much of Cook’s stock is already carrying both, so the next roof on these buildings is a tear-off by law. That’s not bad news. Tear-off is the one chance to fix the slope, drainage, and insulation problems the last two roofs buried. Our recover versus tear-off page explains how core samples make that call honestly.

Where we work in Cook County

Nine Cook County cities, each with its own page and its own roofscape:

• Chicagoland: the largest contiguous business park on the continent, wall-to-wall low-slope roof.
• Franklin Park: rail-served industrial along the Grand Avenue corridor.
• Bedford Park: the Clearing Industrial District and the Midway ring.
• Northlake: distribution stock at I-294 and North Avenue.
• Melrose Park: heavy manufacturing legacy and the roofs that come with it.
• Cicero: dense, older commercial and industrial blocks.
• Berwyn: the Cermak Road retail corridor.
• Alsip: the Cal-Sag industrial corridor.
• Schaumburg: the Woodfield-area commercial mass, retail and office both.

What we install across Cook

Three systems: TPO for the big open warehouse and retail decks, EPDM for penetration-heavy and smaller roofs, and modified bitumen for the walked, mechanical-heavy roofs half this county already wears. We install Carlisle, GAF, and GenFlex systems, every replacement spec’d for a manufacturer system warranty. Installs and full replacements only: no patch crews, no coatings, no residential. On Cook’s older stock that honesty matters, because the patch-money trap is deepest on 60-year-old buildings.

What Cook County buildings are made of

The county’s age shows in its bones. Masonry walls and parapets everywhere, which means real sheet metal work at every roof edge: coping, counterflashing, through-wall details that either shed water or feed it into the wall for decades. Steel decks that have carried three roofs, and in the oldest buildings, wood decks that need honest evaluation before anyone specs a fastener. Rooftop units stacked dense on buildings that were retrofitted for modern HVAC long after they were built, every curb a flashing and every flashing a future leak if it was detailed wrong. This is why Cook County assessments lean so hard on core samples and deck inspection: on a 1960s building, the membrane is the least mysterious thing on the roof. The scope we email prices the deck and sheet metal work as their own lines, so there’s no change-order ambush waiting once tear-off exposes what’s really up there.

Frequently Asked Questions