What Ballast Removal Costs on a Chicago Flat Roof
Vacuum removal in Chicagoland is generally quoted by the square foot, and the number moves with stone type, height, access and haul-off. Here is how to read a quote before you sign one.
The short answer
Roof gravel and ballast removal in the Chicago market is usually priced by the square foot, and published contractor guidance puts full-roof vacuum removal in a range of roughly $0.50 to $1.10 per square foot including haul-off and disposal. A 20,000 square foot pea-gravel roof therefore lands in the low five figures, and a large ballasted roof can run well beyond that. Small areas, such as clearing around rooftop units, are priced as a short crew job rather than by area. We quote one total after seeing the roof; what follows is how to understand the number. The service itself is described on our gravel roof vacuuming and ballast removal page.
What moves the price
Five things. Stone type: embedded pea gravel on a built-up roof vacuums slower than loose river rock because it has to be worked free of the asphalt, but loose ballast is heavier per square foot and there is more of it to haul. Depth: half an inch and two inches are very different tonnages. Height and access: a single-storey warehouse with a parking lot on two sides is the easy case; a four-storey building where the unit sits at the far end of a hose run is not. Haul-off: every ton is trucked and tipped, and the distance to the yard is in the number. And area: there is a mobilisation cost to any vacuum job, so the per-square-foot rate falls as the roof gets bigger and rises sharply on small ones.
Why the per-square-foot rate is a bad way to compare small jobs
For a few hundred square feet around HVAC units, a drain or a walkway, nobody should be quoting by the square foot. Mobilising a vacuum unit for that size of area would be most of the bill. That work is done by a roofing crew with shovels, bags and a hoist, priced as a short job, and it can usually be scheduled in days rather than weeks. If you have been quoted a vacuum rate for a small clearing job, ask for a hand-removal price.
What the removal quote should include
Hauling and disposal, in writing. Roof gravel is inert, not hazardous, but a 50-ton tip fee is real money and some quotes leave it out. Fall protection and site protection: cones, a route for the hose, and a plan for any rooftop air intakes. A condition note on what was found under the stone, with photos. And if the removal is the first stage of a re-roof, a coating or solar, ask whether the same contractor can carry the next stage. When the removal company and the roofing company are different, the schedule risk sits in the handoff between them.
When removal is bundled into a bigger job
Most whole-roof removals in Chicagoland happen because a gravel-surfaced built-up roof has reached end of life and is being torn off, recovered or coated, or because a ballasted roof is getting solar. In those cases the removal is a line inside the larger project, and the question is whether the roofing contractor is pricing it honestly or burying a guess. A contractor who does the removal work can tell you the production rate they expect and what happens if the stone is deeper than it looks. One who is simply passing through a subcontractor's number usually cannot. Our guide on what has to come off a gravel BUR before TPO or modified bitumen covers the sequencing.
Talk to us
Leaders Roofing holds an Illinois Roofing Unlimited License (#104.010248) and has worked on Chicagoland flat roofs since 1996. Send the address, roughly how much of the roof needs clearing and what the removal is for, and we will give you one total that includes hauling and disposal, with no per-square-foot surprises. Details on the gravel vacuuming and ballast removal page, or call (708) 847-5418.