Rock River Roofing & Exteriors
- Roofing Contractor serving Janesville, Wisconsin — based at 27 E Racine St, Janesville, WI 53545.
- Services: roof inspection, storm damage repair, emergency repair, roof replacement, roof repair.
Services Offered
Looking up Rock River Roofing & Exteriors in Wisconsin
Wisconsin roofing-license requirements are not yet covered by our verification program — confirm licensing and insurance with your city or county building department
- Write down the expiry and make sure it outlasts the job.
- Compare the registry name with the name on the contract, and read the status line.
- Start the lookup with the license number; use the business name only if the number fails.
- Have the insurer or agent send the certificate of insurance to you, since a license says nothing about coverage.
Hail and wind history for Janesville, Rock County
For Rock County, the NOAA record since 2017 carries 63 hail entries. On 19 of those days, stones reached 1 inch (a quarter) or more. Golf-ball size or more appeared on 3 days, and the biggest stone measured 2.75 inches, about the size of a baseball. 2026 is the last year that has a 1.75-inch report.
Most hail here arrives in spring and summer: 68 percent from April to July, 31 percent in April. In 5 months of the year, hail is nearly absent in the record.
Measured per square mile, Rock County ranks 8 of 50 Wisconsin counties with 30 or more reports, placing it in the top third. Density works out to 101.9 reports per 1,000 square miles.
15 tornadoes show up in the file too, strongest rated EF2.
Within 25 miles of Janesville, the last 90 days produced 0 NOAA hail reports.
The strongest recorded thunderstorm gust is 85 mph.
| Measure | Value |
|---|---|
| Top gust, mph | 85 |
| Days with hail at 1 inch or more | 19 |
| Reports in April to July | 68% |
| Hail reports since 2017 | 63 |
| Busiest month | April |
| Density rank in state | 8 of 50 |
The single largest day was April 18, 2025: a 2.75-inch stone, about the size of a baseball, reported near Evansville.
| Calendar year | Entries | Largest stone, in |
|---|---|---|
| 2017 | 3 | 1 |
| 2021 | 4 | 1 |
| 2025 | 18 | 2.75 |
The homes under these roofs
Half the homes in Janesville predate 1972; the typical house is about 54 years old. That is long enough for roughly 2 asphalt roof cycles, so replacement, not first install, is the usual job. Set a typical $10,575 asphalt job beside the $209,700 median home value and the roof comes to 5 percent. Pre-1980 construction makes up 63.2 percent of homes in Janesville.
| Measure | Value |
|---|---|
| Median year built | 1972 |
| Homes lived in by owners | 66.5% |
| Median home value | $209,700 |
| Median household income | $71,664 |
| Detached and attached houses | 73.7% |
What a new roof costs in Janesville
Prices in Janesville run about 6 percent below our national basis, so asphalt shingles land at $6,580 to $14,570. Per year of service, metal often costs less than shingles even at a higher price; the last column of the table shows it. The county holds 21 roofing establishments with employees, per the Census. 76.2 percent of them have fewer than 5 employees.
| Material | Service life | Cost per year | Midpoint |
|---|---|---|---|
| Concrete Tile | 40 to 50 years | $440 | $19,740 |
| TPO / EPDM (Flat) | 15 to 25 years | $560 | $11,280 |
| 3-Tab Asphalt Shingles | 15 to 20 years | $500 | $8,695 |
| Architectural Asphalt Shingles | 25 to 30 years | $420 | $11,515 |
| Metal Shingles | 35 to 50 years | $420 | $17,860 |
| Metal (Steel/Aluminum) | 40 to 70 years | $400 | $22,090 |
Common questions, Janesville
- What time of year does Janesville get hail?
- Spring and early summer carry most of it: 68 percent of entries come between April and July, April first at 31 percent.
- Where can I look up the license for Rock River Roofing & Exteriors?
- The Wisconsin lookup shows status and expiry. Set both beside the contract and ask the roofer for proof of insurance.
- What is the biggest hail on record for Rock County?
- Hail since 2017 topped out at 2.75 inches, about a baseball; golf-ball hail or larger came on 3 days.
- What is the typical house age in Janesville?
- Census data puts the typical build year at 1972. Asphalt roofs wear out in 15 to 30 years, so many roofs there have been replaced at least once.
- How soon should a roof be inspected after hail?
- Do not wait for a leak. A short inspection after the storm documents the damage while the date is fresh.
- How much is a roof replacement in Janesville?
- Asphalt shingles on 2,000 square feet run $6,580 to $14,570 in Janesville, and the middle of that range is $10,575. Metal and tile start higher; the table above shows each material.
More Roofing Services in Janesville, WI
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