Insulation for New and Existing Homes in Janesville, WI
Insulation Solutions to Maximize Energy Efficiency in Janesville

As the county seat of Rock County, there’s never a dull moment in Janesville. Nicknamed “Wisconsin’s Park Place” thanks to its over 2,600 acres of park land, residents and visitors alike have no trouble enjoying and exploring this beautiful city. Throughout the year, from a leisurely spring day stroll through the colorful Rotary Botanical Gardens, to a sticky summer day hike up the “Devil’s Staircase”, to a wonderful winter day sledding down a local hill with family and friends, locals enjoy every type of weather Janesville has to offer. Two things are certain: Janesville’s weather is never boring (from our frigid winters to our wet, muggy summers) and no one likes to return to an uncomfortable home after a long day of work or play.
Mother Nature oversees the weather, but Rockweiler Insulation can help with your uncomfortable home.
Proper insulation and air sealing are the catalysts to creating a cozy and comfortable home throughout every season. Our expert team has been serving Janesville and its surrounding communities for over 40 years with only the highest quality insulation products and services. Whether you’re a builder in the fast-growing Northeast neighborhood, or a homeowner in the timeless Courthouse Hill Historic District, our team is ready to provide you with the tailored insulation solutions your project needs.
We have also undergone extensive training to be named an Owens Corning® Certified Energy Expert®. This distinction means we are one of the best fiberglass insulation providers in the country, giving you even more insulation options and new home insulation warranty.
Bringing Together the Past and the Present with Energy Efficiency Solutions for Janesville Homes
The City of Janesville is made up of a diverse blend of historic and modern living. From the grand Victorian style homes from ages past to the newly constructed, modern Cape Cod homes of today, every home needs proper insulation and air sealing to help preserve and protect it for both current and future generations.
At Rockweiler, our building science training and real-world experience are the ideal combination to bring the most tailored insulation solutions for every Janesville area home.
Attic Insulation & Air Sealing
The best place to start on your path to energy efficiency is in the attic. Insulating and air sealing the attic of your Milton or Edgerton home is key to a cozy place to live.
Air sealing with caulk or spray foam closes the tiny gaps and penetrations that allow valuable conditioned air to escape your home, while insulation provides the thermal resistance your home needs to stay warm. We install quality materials, including blown-in fiberglass insulation and spray foam. Whether your home is still in the building stage or needs a retrofit efficiency boost, it’s always a good time to insulate and air seal your Janesville area attic.
When you insulate and air seal your attic you can expect:
- Lower energy bills
- Improved interior comfort
- Enhanced indoor air quality
- Less strain on your HVAC system
- Help in preventing ice dams
- Added moisture control
Basement Box Sill Insulation
Turn your Janesville or Beloit home’s basement into a whole new floor to explore with the addition of basement insulation. Did you know that the area around the perimeter of your basement, where the box sills are located, is one of the thinnest points in your home’s exterior? It’s true. Without proper insulation, this area can affect the comfort of your basement and the living space above. We take care of the problems that cost you money and comfort by installing spray foam insulation in your box sills. Spray foam does double duty by insulating your box sills as well as sealing the many tiny air leaks around them.
The benefits of insulating your basement box sills include:
- Warmer main level floors
- Lower heating bills
- Durability and protection from temperature-induced condensation
- Pest control
Crawl Space Insulation
For those area homeowners with a crawl space beneath their home, it’s important to install both a thermal and moisture barrier to safely protect your home from the earth below it. Plus, for those living close to the Rock River, moisture control is a big factor too. Count on our expert team to turn your creepy crawl space into an energy-efficient area with our insulating and encapsulating solutions.
Crawl space insulation helps improve your home’s:
- Heating and cooling for better control of your indoor temperature.
- Energy efficiency thanks to less conditioned or heated air being lost through the floor of your home.
- Moisture prevention by sealing your crawl space away from condensation and moisture that can cause mold and mildew and affect indoor air quality.
Garage Insulation
If cars could talk, they would be big proponents of garage insulation. Whether you’re heading out for your next snowy adventure along the Ice Age Trail or storing your mementos from trips past, garage insulation is the ideal way to keep your car and your souvenirs from freezing in the winter and overheating in the summer. It’s the ideal “creature comfort” for your Leyden area home. We take care of insulating your garage’s ceiling and walls for a space that’s protected from the outside elements.
Garage insulation provides:
- Warmer rooms above the garage during winter and cooler rooms during summer.
- Better protection for items stored in the garage.
- The ability to keep your car above freezing throughout winter.
- Less energy loss through your garage walls.
New Construction Insulation
During construction is the best time to maximize the energy efficiency of your Janesville neighborhood home building project. Our experienced team has you covered with the best insulation and air sealing solutions for every part of your new home project, including the walls, attic, crawl space and basement. We also provide upgrades such as sound control and garage insulation for extra comfort.
Adding proper insulation during construction ensures:
- An energy-efficient home from the start
- Lower energy bills for future owners.
- A home that meets or exceeds state energy codes.
- The biggest savings on installation.
Don’t worry, your new home project is good to go from the start with our expert insulation installation.
LEARN MOREWall Insulation
With winter temps in Janesville that dip down to -10°F and summer highs that peak at 90°F+, you need a home that’s protected from the biting wind and intense heat. Sadly, many homes in our community were not properly insulated during construction, especially in the exterior walls. This has left homeowners throughout southern Wisconsin, including Brodhead and Harmony, uncomfortable throughout every season. But our team is here to save the day! Our expert team takes extra special care of your home’s exterior and densely packs blown-in cellulose insulation into your existing walls to create a blanket of comfort for you and your family.
Once the job is done, you’ll enjoy:
- A more energy-efficient home
- Lower energy bills
- A comfy home throughout every Janesville season.
- Less stress on your HVAC system
Energy Initiatives in Janesville
The City of Janesville believes strongly in creating a more sustainable community. The Sustainable Janesville Committee works to do just that. The city is also a member of the state’s Green Tier Legacy Community program that helps align local business objectives with environmental stewardship. As for residential energy efficiency standards, Janesville requires that all new homes meet or exceed the state adopted 2009 Wisconsin Building Code for all new home construction. This code is based on the 2009 International Energy Conservation Code (IECC).
There are also federal tax rebates available through the Inflation Reduction Act (IRA) for energy efficiency upgrades in both new and existing homes. Also, check with local utilities for any energy rebates and initiatives they may currently have.
Areas We Serve In and Near Janesville
Rockweiler Insulation provides quality installation and service to every part of Janesville and its surrounding communities, including, but not limited to:
- Anderson
- Avalon
- Avon
- Beloit
- Bradford
- Brodhead
- Clinton
- Edgerton
- Evansville
- Harmony
- Johnstown
- La Prairie
- Leyden
- Lima
- Magnolia
- Milton
- Newark
- Town of Janesville
Janesville FAQs
Q: What service area does Rockweiler cover in Janesville?
A: Although we are officially located in Verona, we serve all of Janesville and its surrounding communities throughout southern Wisconsin.
Q: What are some common insulation challenges in Janesville?
A: The homes in Janesville are a beautiful blend of old and new. Many of the city’s older historic homes may lack sufficient insulation and even still have insulation containing harmful materials, while many homes built in the mid-20th century were also under insulated, especially to today’s standards. Janesville homes come in many styles, including Victorian, Cape Cod, Craftsman, and Ranch style, all which need tailored insulation solutions to maximize their energy efficiency. Homeowners who live along the Rock River need to factor in moisture solutions for their homes as well.
Q: Does Janesville follow any local building codes and energy requirements for new homes?
A: Absolutely, the City of Janesville and its surrounding communities follow the approved statewide 2009 IECC building code for all new home construction.
Q: Who do I contact to schedule an appointment?
A: You can contact our team at 608-999-4270 or contact us. We’re here to answer all your questions!
Insulation Installation Just Right for Janesville
At Rockweiler Insulation, we’ve called southern Wisconsin home since 1983. We’ve spent the last 40+ years building a name for ourselves as an insulation company homeowners, builders and contractors throughout Janesville can trust. Our hard work and dedication are evident in how we treat our customers and how we complete each job. We take the time and effort needed to guarantee your home renovation or new home insulation project is done right.
Contact us today to receive your free estimate for your Janesville area home or building project.