Service Area · Janesville, WI

Janesville Roofers

Roofers in Janesville, WI working out of our Belvidere, IL base today with a Janesville office opening soon. Stateline crew, Wisconsin Dwelling Contractor cert, WI code on every Janesville roof, free inspection on every Rock County address.

Finished blue-grey lap siding replacement on a large two-story Janesville WI home with a wood deck
Siding replacement · Janesville WI

Wisconsin builds to a different code than Illinois

The ice-and-water shield rule for your Janesville roof is not the same as the rule a mile south. A crew quoting Illinois numbers on a Janesville job is quoting the wrong code.

Wisconsin code

What WI requires (SPS 321.28)

  • Ice-and-water shield required on shingle or shake roofs over heated rooms when the slope is 4:12 or shallower
  • The shield must run at least 30 inches up from the roof edge
  • And must reach at least 12 inches past the inside of your exterior wall
  • Permit pulls through Janesville Building & Development Services. State-licensed Dwelling Contractor required

Illinois code

How Illinois differs (R905.1.2)

  • Ice-and-water shield required wherever Illinois history shows ice-damming, not based on slope
  • Shield runs from the roof edge to at least 24 inches past the inside of your exterior wall
  • Different code, different measurement, different inspectors than Wisconsin
  • Used in Belvidere, Rockford, and the rest of northern Illinois

From Courthouse Hill Victorians to east-side new builds

Janesville housing spans Victorian bluff homes, GM-era postwar around Look West, and 2000s east/west subdivisions. Each era fails differently.

  • Courthouse Hill (NRHP-listed since 1986): Italianate, Queen Anne, and Second Empire mansards. Slate originals, period flashing.
  • Look West: 19th-century Craftsman bungalows in the Old First Ward. Old chimneys that need reflashing on every reroof.
  • Columbus Circle & Old Fourth Ward: more historic districts near the Rock River. 13 districts total in Janesville.
  • Arbor Ridge & Sheiffer Park: 2000s+ subdivisions, OSB decking and modern asphalt, not slate or wood shake.
Elite roofer on the ridge during a roof inspection of a grey asphalt shingle roof in a Janesville WI neighborhood
Roof inspection · Janesville WI

The June 22, 2024 tornado that hit Janesville's south side

The National Weather Service confirmed a tornado touched down on Saturday evening, June 22, 2024, carving a damage track through residential blocks on the south side of the city.

  • EF-2 rated by NWS Milwaukee/Sullivan, the highest tornado intensity recorded in Janesville's recent storm history
  • Over $20 million in damage across homes, businesses, and infrastructure on the south side
  • Roughly 10,000 Alliant Energy customers without power at peak; the City received over $100,000 in tornado-recovery aid through February 2025
  • Damage signature on Janesville roofs: trees snapped onto pitched roofs, step flashing peeled on Courthouse Hill mansards, ridge-cap loss on east-side ranches, hidden hits on slate and wood-shake

A tornado with winds past 110 mph. $20M+ in damage. 10,000 households without power. A storm that rewrites what Rock County roofs have to handle.

Janesville districts and Rock County reach

Wisconsin-licensed crews work the Rock River corridor from the Illinois line up through Beloit and Janesville, plus Milton, Edgerton, and east to Whitewater.

  • Courthouse Hill · Look West
  • Columbus Circle · Old Fourth Ward
  • South Main · Jefferson Avenue historic districts
  • Prospect Hill · Arbor Ridge · Sheiffer Park
  • Beloit · Milton · Edgerton
  • Whitewater · Footville
  • All of Rock County, WI
Janesville FAQ

Janesville roofing questions, answered

Does Wisconsin require a Dwelling Contractor license to roof my Janesville home?

Yes, and the Qualifier requirement is the part that blocks paper-shell chaser companies. WI DSPS requires the company to hold Dwelling Contractor certification (ours: #747-DCFR) AND have a Dwelling Contractor Qualifier on staff who passed the 12-hour state course. Two separate credentials, both verifiable on the DSPS public lookup. A chaser can fake a license number on a yard sign; they cannot fake a Qualifier on payroll.

How does Wisconsin's roofing code differ from Illinois's?

For most Janesville homeowners the practical impact is one chapter of the bid: ice-and-water shield linear footage. WI triggers on slope (4:12 or shallower), IL triggers on regional history. A bid copied from an IL template will under-measure the membrane on a 3:12 porch addition by 18 inches of run, fail the Janesville deck inspection, and force a callback. Ask the crew to point out the slopes they read as 4:12 or shallower; if they can't, they're quoting the wrong code.

Do Janesville's Courthouse Hill historic homes need a different roofing scope?

Yes, and the gotcha is the historic district guidance layered on top of UDC. Janesville's historic preservation review can disqualify a standard architectural shingle on certain Courthouse Hill, Look West, and Old Fourth Ward properties, sometimes requiring slate-look composite, copper-pan valleys, or specific ridge profiles. The first call before any scope gets written should be Janesville's Historic Commission, not the manufacturer rep. A reroof bid that doesn't reference the district guidance is one the commission can stop mid-job.

Can a Janesville roof be replaced during a Wisconsin winter?

Yes, with conditions. Most asphalt-shingle warranties from GAF, IKO, and CertainTeed require a hand-seal step on cold-weather installs because the factory adhesive strip needs sustained warmth to bond. A Wisconsin winter install in Janesville means every cap and field shingle gets hand-tabbed with roofer-grade adhesive under the strip, then re-checked once spring temperatures arrive. If your roof is leaking actively in February, that's the call to make. If it can wait six weeks for the thaw, it should.

How does a tornado claim work in Rock County, Wisconsin?

Wisconsin carrier deadlines vary by policy; full timeline lives on our insurance claim guide. The Rock County piece: a Janesville Building & Development Services permit must precede any tarp or replacement work. We pull it the same day we are on-site, with WI Dwelling Contractor cert #747-DCFR on the application.