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Spray Foam Insulation in Janesville, WI

Find top-rated spray foam contractors and save up to 37% on energy bills

💰 Estimated Energy Savings in Janesville

37%
Average Energy Savings
Typical range: 32% - 42%
$1,732
Estimated Annual Savings
Based on $390/month average energy cost
4 years
Average Payback Period
Return on investment timeline

Note: Actual savings vary based on home size, current insulation, energy rates, and climate conditions. These estimates are based on Department of Energy data for Very Cold.

Verified Contractors in Janesville

Janesville

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Direct: 6083147611

5⭐
4 Google reviews

Recent Reviews:

Bobby Wyss★★★★★a year ago

I recommend Janesville Insualtion. Did a great job insulating and drywalling my garage. Thanks !

Roger Bunting★★★★★4 years ago

They were prompt and finished in a day, and at a reasonable price.

-Maria Alexandra S. Delos Santos-★★★★★5 years ago

Weatherseal and Roofing, LLC

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Direct: 6083303626

5⭐
6 Google reviews

Recent Reviews:

Daniel Miralles★★★★★3 weeks ago

We bought a Cape Cod style house in a few years ago and soon found out it was poorly insulated. I found out that Cape Cod style houses are one of the most difficult types of houses to insulate due to the many voids that are built into the construction. The house also needed a new roof so after researching spray foam insulation and talking to Brad the owner of Weather Seal Insulation and Roofing I decided it would be the best option. Weather Seal is one ,of the few companies that does both roofing and spray foam insulation. The advantage of which benefited us because while they were tearing off the old roof they discovered that the gable at the front of the house and over part of our living room, had no insulation. Brad was able to quickly come and spray foam that space so the roofers could continue their work. Now our living room is much warmer. Another advantage of spray foam insulation applied to the underside of the roof deck is that the insulation on the attic floor can be removed, which we had done, providing easy access to electrical wiring if it needs to be repaired or upgraded. When inspecting our house for a quote, Brad suggested spray foaming the basement walls, because a significant amount of heat is transferred through the walls. I was skeptical at first, but after thinking about it, it made sense, and with the added coat of protective white paint over the spray foam, I would brighten up the basement which needed to be painted anyway. Now my basement is the warmest level in the house, and the basement looks cleaner and brighter. Even my father in law, who has many years experience in the construction trades, was impressed at how well it looked. The whole house is noticeably warmer and the furnace comes on less often.

Bill McClure★★★★★2 months ago

Brad was given a near impossible task after another contractor left me high and …wet… (insulation). After multiple walkthroughs to make sure he covered every scenario, and ensuring he had a step by step plan, his team executed a near flawless job. Incredible communication, incredible work ethic, and willing to go above and beyond to make sure I was happy. Count yourself lucky if you get the chance to work with Weatherseal and Roofing. Thanks again, Brad!

Linda Michaelson★★★★★5 months ago

I am a Single Woman owning a home and found rodent damage on my roof. Upon searching for Roofing Repairs, Weather Insulation and Roofing Called back came right away after holiday weekend and came over at 6:45pm and stayed until repair was done. Then he found things that when I had roof installed they failed to do during insulation and also took the time to take care of that. I am amazed with this Company and Highly Recommend using this service. Brad I thank you for all your honesty and extra mile you took for me. I will call you if needing repair again for sure. Thank You

Beneficial Insulation Solutions

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Direct: 6087430470

5⭐
3 Google reviews

Recent Reviews:

Shawn Uschan★★★★★a year ago

I just worked with this company. Great group of guys, who actually care about their work and reputation. I would recommend this group to my mother 100%.

Richard J★★★★★4 years ago

Great company to work with, at very fair price. Cliff and his men have the expertise and equipment to troubleshoot and air seal and insulate hard to reach attic areas.

Randy Zwieg★★★★★4 years ago

Frequently Asked Questions — Spray Foam Insulation in Janesville

Why is spray foam insulation especially important in cold climates like Janesville?▼
In cold climates like Janesville, WI, proper insulation is critical to preventing heat loss, ice dams, and frozen pipes. Spray foam's air-sealing properties stop the cold air infiltration that traditional insulation cannot address. It also prevents the moisture buildup inside walls that leads to mold in cold-weather freeze-thaw cycles. Homeowners in WI typically save 25–35% on heating costs. Note: in tightly sealed homes, proper mechanical ventilation is commonly recommended to maintain fresh air exchange without losing the heat you've paid for.
Does spray foam insulation prevent ice dams in Janesville?▼
Yes — spray foam insulation is one of the most effective solutions for preventing ice dams in cold climates like Janesville, WI. Ice dams form when heat escapes through a poorly insulated attic, melting snow that refreezes at the eaves. By creating an air-tight thermal barrier in the attic, spray foam eliminates the heat loss that causes ice dams in the first place.
What R-value do I need for spray foam insulation in Janesville?▼
For cold climates like Janesville, WI, the Department of Energy recommends attic insulation of R-49 to R-60. Closed-cell spray foam provides R-6 to R-7 per inch, meaning 8–10 inches achieves code-minimum performance. Open-cell foam at R-3.5 per inch requires greater thickness. A local contractor familiar with WI building codes can recommend the exact specification for your home.
Is spray foam insulation worth the cost?▼
For most homeowners, yes. Spray foam creates an air-tight seal that traditional insulation cannot match, reducing energy bills by 15–35% annually. It also adds structural rigidity, acts as a moisture and vapor barrier, reduces outside noise, and can increase home resale value. The higher upfront cost compared to fiberglass is typically recovered within 3–7 years. One important note: because spray foam creates a very tight building envelope, proper mechanical ventilation is important to maintain healthy indoor air quality and prevent interior moisture buildup. This is typically handled by an Energy Recovery Ventilator (ERV) — a system that brings fresh outside air in while pushing stale air out, recovering the energy from the outgoing air so you don't waste what you paid to heat or cool — or a Heat Recovery Ventilator (HRV), which works similarly but is optimized for cold climates. A qualified contractor will assess whether your home needs ventilation upgrades as part of the installation.
How much does spray foam insulation cost?▼
Spray foam insulation typically costs $1.00–$3.00 per square foot installed, depending on the type and your location. Open-cell foam runs $0.44–$0.65 per board foot, while closed-cell foam costs $1.00–$2.00 per board foot. A typical 2,000 sq ft home attic costs $2,000–$6,000. Most homeowners recoup this investment within 3–7 years through energy savings of 15–35% annually.
What is the difference between open-cell and closed-cell spray foam?▼
Open-cell spray foam is softer, less dense, and less expensive. It expands significantly and is ideal for interior walls, attics, and soundproofing. Closed-cell spray foam is denser, stronger, and provides a moisture barrier — making it better for exterior applications, crawl spaces, and areas prone to flooding or humidity. Closed-cell also has a higher R-value per inch (R-6 to R-7 vs R-3.5 to R-4 for open-cell). One key difference: open-cell foam allows some vapor movement, while closed-cell acts as a vapor barrier — an important consideration for your home's ventilation needs.
How long does spray foam insulation last?▼
Spray foam insulation is one of the most durable insulation options available, with a lifespan of 80+ years when properly installed. Unlike fiberglass batting which can sag and settle over time, spray foam maintains its shape and insulating properties indefinitely. It will typically outlast the building it is installed in.
How do I find a qualified spray foam insulation contractor?▼
Look for contractors who are licensed, insured, and have verifiable reviews. Spray foam requires specialized equipment and training — improper installation can cause off-gassing, adhesion failure, or fire hazards. Ask for references, verify their insurance, and get at least 2–3 quotes. A qualified contractor will also assess your home's ventilation needs — a tightly sealed spray foam installation requires adequate mechanical ventilation to prevent moisture and indoor air quality issues. FoamMatch pre-screens all listed contractors for licensing and insurance so you can compare verified professionals in your area.
How long does spray foam installation take?▼
Most residential spray foam jobs take 1–2 days depending on the size of the area. A standard attic takes 4–8 hours. After spraying, the foam cures within 24 hours, though most contractors recommend waiting 24–72 hours before occupying the space due to off-gassing during the curing process.
Does spray foam insulation need to be replaced?▼
No — spray foam insulation does not need to be replaced under normal circumstances. Unlike fiberglass insulation which degrades over time, spray foam maintains its R-value and air sealing properties for the life of the building. The only reasons to remove or replace spray foam are water damage, renovation work, or improper original installation.
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