Commercial Flat Roofing in Chicago & the Suburbs

Expert commercial flat roof installation and replacement across Chicago. TPO, modified bitumen, PVC, EPDM — engineered systems built to protect your investment for decades.

Commercial Flat Roof Systems We Install

Every commercial building has different needs. We install and maintain all major flat roofing systems — each engineered for Chicago's demanding climate.

TPO (Thermoplastic)

White reflective membrane, heat-welded seams. The industry standard for energy-efficient commercial roofing.

20–30 year lifespan

Modified Bitumen

Torch-applied or self-adhered asphalt system. Proven in Chicago winters. Handles foot traffic. Budget-friendly.

15–20 year lifespan

PVC Membrane

Superior chemical and grease resistance. Ideal for restaurants, kitchens, and industrial facilities.

20–30 year lifespan

EPDM Rubber

Synthetic rubber membrane. Most affordable single-ply option. Reliable weather protection for smaller flat roofs.

15–25 year lifespan
Aerial view of GSKI crew working on commercial flat roof

Our Commercial Flat Roof Process

From inspection to warranty — here's how we handle commercial flat roof projects.

1

Free Inspection

We inspect your commercial building, and assess the condition. You get an honest evaluation and photos — no pressure, no obligation.

2

Detailed Estimate

A written estimate with materials, scope of work, timeline, warranty terms, and total cost. No hidden fees, no surprises.

3

Tear-Off & Inspection

We strip the old roof down to the deck and inspect every inch. Damaged decking is replaced before anything new goes on.

4

Installation

New insulation boards, membrane installation, heat-welded seams, custom flashing around all penetrations — installed by our experienced crew, not subcontractors.

5

Cleanup & Walkthrough

Magnetic sweep of the yard for nails, debris removal, and a final walkthrough with you. Your property looks better than before we started.

6

Warranty & Support

Manufacturer warranty on materials plus our workmanship warranty. We service the roof for its entire lifetime — if you ever have a leak, we'll be there.

Storm Damage? We Handle the Insurance.

If your roof was damaged by hail, wind, or fallen debris, your homeowner's insurance likely covers the replacement. We manage the entire claims process for you.

We inspect your roof and document every bit of damage with photos and detailed notes. We meet with the insurance adjuster on-site and make sure nothing is overlooked. We handle supplemental claims if additional damage is found during tear-off. Your out-of-pocket cost is typically just your deductible — insurance covers the rest.

Residential roof tear-off showing storm damage Completed commercial flat roof after insurance claim

Serving Chicago & the Suburbs

We replace residential roofs across Chicagoland — from city bungalows to North Shore estates.

Our commercial flat roofing crews serve Chicago, Hinsdale, Oak Brook, Elmhurst, Oak Park, Highland Park, Park Ridge, Wilmette, Glencoe, Northbrook, and all surrounding communities across Illinois. No matter where you are, we'll come to you for a free inspection.

Need a Commercial Flat Roof?

Get a free inspection and honest estimate — no pressure, no obligation.

Request Your Free Inspection