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Top-Rated Spray foam insulation pros in Janesville - Updated Nov 2026

Avatar for Horn Insultation
Horn Insultation
4.7(
72
)

Serving Janesville, IL and surrounding areas

Approved

In business since 1992

Free estimates

Credit card accepted

"Horn Insulation did a tremendous job insulating our house. The quality of their work was great and they were a pleasure to work with. I highly recommend them!"
27 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for IKONIK INSULATION, LLC
IKONIK INSULATION, LLC
5.0(
8
)

Serving Janesville, IL and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Small jobs welcome

"Great group of guys. Very professional and efficient. Brandon and his crew fixed me up with my insulation needs. Hands down will use them again. Get ahold of ikonik insulation llc for all your insulation needs."
Response time1 day
Response rate97%
5 neighbors recently requested a quote
Avatar for Quality Garage Door & More
Quality Garage Door & More
5.0(
10
)

Serving Janesville, IL and surrounding areas

Approved

In business since 2004

Free estimates

Emergency services offered

With years of experience in business Quality Garage Door & More is your industry expert in Beecher City. We pride ourselves on our extreme professionalism and attention to detail. Our customer satisfaction guarantee will assure you we will not leave your property until you are completely satisfied with our work. As a family owned and operated business you can trust that we will treat your home as we would treat our own. Give us a call today we look forward to working with you!

new garage doors
new garage doors
Privacy fence
Privacy fence
Garage door upgrade

+1

Response time6 hrs
Response rate93%
18 neighbors recently requested a quote
Avatar for Comfort 1st Insulation
Comfort 1st Insulation
4.6(
32
)

Serving Janesville, IL and surrounding areas

In business since 2016

Free estimates

Emergency services offered

"I was looking for loose fill cellulose, and some spray foam in the basement. Mike, the owner, came out and did a free visit. Took measurements and gave me an estimate. Easy company to work with, I would refer/pick them again."
Evenly Applied Foam in the Band Joist
Sealing the Joist
Overview of Insulated Band Joist
Before Insulation Applied
Before Insulation - Empty Attic

+9

Response time1 day
Response rate92%
Recommended by82%of homeowners
Avatar for Olmsted Brothers Insulation, Inc.
Olmsted Brothers Insulation, Inc.
5.0(
11
)

Serving Janesville, IL and surrounding areas

In business since 2001

Free estimates

Warranties offered

"I worked with Olmstead Brothers to have my pole barn spray foamed. I was so happy throughout the entire process. I have worked with several insulators through years of home construction, but Kyle and his crews bring a level of professionalism that is not typical in the residential construction industry. Kyle was extremely knowledgeable and easily answered all of my questions. The crew arrived right on time and did a great job of protecting all the surfaces to keep foam off my floor, lights and doors. They cleaned up nicely and were a pleasure to work with. I would recommend Olmstead Brothers to anyone interested in insulating a home, barn or any other structure!"
Closed Cell foam
Closed Cell foam
Closed cell foam
Closed cell foam
foam and cellulose.

+20

Response time1 day
Recommended by100%of homeowners
D.L.R Insulation
5.0(
8
)

Serving Janesville, IL and surrounding areas

In business since 2024

Free estimates

Credit card accepted

"I had old asbestos insulation in a new house that we were moving into that we wanted removed and replaced. Dakota was quick to respond, come out to do a free quote, schedule and execute. I was worried that it would be expensive due to it being hazard cancer causing materials. But he had everything he needed to get it done quickly and safely and affordable! Amazing job!"
Response time2 days
Response rate95%
Recommended by87%of homeowners
Avatar for Crawlspace / Basement Waterproofing Solution
Crawlspace / Basement Waterproofing Solution
4.4(
256
)
Insulation - Install or Upgrade

Serving Janesville, IL and surrounding areas

In business since 1998

Free estimates

Credit card accepted

"We had a different person who came out before them who was horrible and then I tried Crawlspace/Basement Waterproofing Solution because they were reasonably priced and they worked with me on scheduling their time so that they would be there when the electrician are there. They worked together with the electricians and were all done. They were wonderful. It was an all-day project but everybody worked together. Everybody showed up, everybody cooperated, and it was all done in one day with a big job. They were very good with the whole thing. The price was really good deal and all they have to do is seal from the outside to the inside. The biggest thing for us is that, they were here when everybody is here to do one thing. They are really good and we only had one problem but it was all filled up. This company gave exactly what we needed, showed up when they are supposed to, and did a great job. It was perfect. I would recommend right away to anybody before anybody else.  We were very impressed with them."
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+13

Recommended by90%of homeowners
Avatar for Insulation Service
Insulation Service
5.0(
2
)

Serving Janesville, IL and surrounding areas

In business since 1974

Free estimates

Offers commercial services

With over 30 years of experience in the Insulation industry, we are the experts you need to take care of your home or business. We handle everything from insulation to waterproofing. We will treat your home as we would treat our own. Give Insulation Service, a call today, we look forward to working with you!

Response time4 days
Recommended by100%of homeowners
Avatar for American Home Shield – Home Warranty
American Home Shield – Home Warranty
3.5(
5,689
)
Insulation - Install or Upgrade

Serving Janesville, IL and surrounding areas

In business since 1971

Credit card accepted

"Well, the first time the replacement was ordered it was the wrong one, which of course, delayed the installation a week. When it was finally installed I had to pay an additional $850 for code upgrades. This I was not informed of by Home Shield. Then we noticed that there was water on the garage floor and found that the pipe coming in from the wall was leaking at the wall so had to call the plumbing company back out to fix it. They first tried to say it was not their fault but since there wasn't a leak before they installed they did fix it. I have used Home Shield a few times before and never had a problem. Some of the companies they use are not the best so you have to research them before you commit. I have found HS service to be good if you do your homework. At the end of the day I was without hot water for almost 3 weeks but it was do to the plumbing company they sent out."
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+2

Recommended by65%of homeowners
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FAQs for spray foam insulation projects in Janesville, IL

Old insulation should be removed when it shows damage, contamination, or heavy deterioration. If you notice water stains, rodent droppings, mold, or large gaps, plan on taking it out to protect your home’s energy performance and indoor air quality. Removing compromised material eliminates health hazards, cuts energy loss, and sets the stage for a safer, more efficient attic—all while keeping utility bills in check.

R-value measures how well insulation resists heat flow—the higher the number, the better it slows heat transfer. The right R-value keeps your home warmer in winter and cooler in summer, saving energy year-round. Match the rating to your climate zone and have a pro verify performance over time, because moisture or settling can lower R-value and cut efficiency.

Attic insulation can stay in place for 80 to 100 years, but its performance often drops after the first 15. As dust, moisture, or mold build up, the material loses R-value and allows heat to escape. Schedule periodic inspections so a pro can tell you when replacement makes sense—helping you keep energy bills down and indoor comfort up.

You can over-insulate an attic. Beyond the recommended R-value, extra layers don’t add efficiency and can trap moisture, leading to mold or reduced performance. A local insulation pro can measure current levels, confirm the right target for your climate, and advise on any adjustments so you avoid future energy or maintenance headaches.

Insulation can be damaged by mold, pests, water leaks, or accidental electrical contact. When the material is compromised, it loses R-value and can introduce health hazards. Removing and replacing affected sections restores efficiency, while routine inspections from a qualified pro help you catch problems early and keep your attic safe and energy-smart.