Prevents Conduction: Spray foam reduces thermal transfer from materials in contact with the insulation itself, such as wood or drywall.
Top-Rated Spray Foam Insulation Experts in St. Paul, MN
For superior energy efficiency in the Twin Cities, spray foam insulation is the premier choice for both residential and commercial properties in St. Paul. Our deep understanding of Minnesota’s harsh winters and humid summers, combined with the resources of a national network, allows us to deliver customized spray foam solutions tailored to local building codes and climate needs.
As the trusted experts for spray foam insulation in St. Paul, Koala Insulation is committed to providing professional recommendations and high-quality workmanship on every project to ensure lasting comfort and performance.

A Superior
Thermal & Air Barrier Services in St. Paul

These capabilities define the insulation type:
Blocks Air Infiltration: The insulation system prevents treated air from transferring through gaps, holes, or damage in exterior walls and roofs.
Stops Moisture: Spray foam blocks moisture from entering the treated space and contributing to heat loss or gain.
Advantages Of
Spray Foam Insulation in St. Paul
Spray foam insulation outperforms all other types of insulation by large margins because its long-term benefits outweigh its initial installation costs. Spray foam also offers superior sealing properties and is environmentally friendly.
In St. Paul, where seasonal shifts bring high humidity and harsh winter air, spray foam insulation acts as a vital barrier against dust, allergens, and pollutants. By creating an airtight seal that manages moisture and prevents air infiltration, spray foam significantly enhances indoor air quality and home health while maximizing energy efficiency for Twin Cities homeowners.
Spray foam insulation is a premier solution for St. Paul homeowners looking to protect their property from moisture intrusion and enhance fire safety. Its robust sealing properties effectively minimize mold growth and mitigate the risk of water damage caused by Minnesota’s humid summers and heavy snowfall. By creating a secure, fire-resistant barrier, this insulation fosters a healthier and safer living environment, providing long-term comfort and peace of mind in the Twin Cities climate.
Spray foam insulation provides an essential layer of protection for St. Paul homes against local pests and rodents looking to escape Minnesota’s extreme seasonal temperatures. By creating a seamless, airtight seal in critical areas like rim joists and attics, this durable barrier eliminates the gaps and entry points that insects and wildlife often exploit. Investing in professional spray foam installation not only enhances your property’s energy efficiency but also delivers long-lasting peace of mind by fortifying your home against unwanted intruders year-round.
Spray foam insulation goes beyond sealing air leaks by reinforcing the structural integrity of your St. Paul home. Once cured, it forms a rigid, high-density layer that bonds to framing, sheathing, and drywall, helping the building better withstand the natural shifting and settling common in the Twin Cities’ freeze-thaw cycles. This added rigidity reduces wall flex, minimizes vibrations, and enhances soundproofing, ensuring a quieter, more durable, and energy-efficient residence for years to come.
By sealing gaps and cracks in your St. Paul home, spray foam creates a continuous air and sound barrier within walls, floors, and ceilings. This dense structure effectively dampens noise transfer, muting everything from bustling Twin Cities traffic to internal HVAC and plumbing lines. The result is a quieter, more peaceful indoor environment that remains comfortable regardless of the season.
Choosing spray foam insulation is a sustainable way for St. Paul homeowners to build a more energy-efficient and resilient residence in the Twin Cities. Unlike traditional materials that may shed fibers, professionally installed spray foam is chemically inert once cured, ensuring it doesn’t release harmful particles into your living environment. This permanent, seamless air seal is particularly effective in Minnesota’s climate, as closed-cell varieties do not retain moisture or support mold growth. By acting as a robust secondary barrier against water damage and ice dams, spray foam helps preserve your home’s structural integrity and reduces your carbon footprint for decades.
4-Step Spray Foam Process in St. Paul
Spray Foam Installation Process

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- Prep for Safe InstallationEvery spray foam installation project starts with our detailed safety and preparation process. We shut down your HVAC system; protect floors, furniture, and belongings; and set up negative-pressure ventilation to keep all spray foam particles safely contained. Every installation team member has received American Chemical Council safety training and wears full protective gear.
- Precisely Apply Spray FoamUsing industry-leading spray foam installation equipment, we test the sprayer, apply even lifts to ensure proper expansion, and measure spray depth as we go. Careful installation and coverage ensure the foam seals gaps properly and cures correctly.
Koala Difference: We calibrate mixes and test sprays to ensure the correct compound 1:1 ratio of A-side (isocyanate) and B-side (polyol resin) to achieve the desired results.
- Trim and InspectOnce the spray foam application has cured, we trim excess materials and ensure ideal coverage, thickness, and adhesion. Our spray foam installers continue to ventilate the area as we inspect our work proactively.
Koala Difference: We prepare a detailed inspection checklist based on your approved project plan, so you know the work was done right.
- Clean Site, Re-Entry & Ongoing Support
We thoroughly clean the work area, removing all lingering insulation materials and debris to ensure your property is ready for use. Our team provides clear guidance on when it is safe to return to the treated space, and we take pride in leaving every St. Paul home or business cleaner than we found it. All spray foam projects by Koala Insulation of St. Paul are backed by a limited lifetime residential insulation warranty for your long-term peace of mind.
Koala Difference: Our team includes all relevant paperwork to make claiming any tax credits and rebates easy!
Ready to get your project started? Work with the most experienced spray foam insulation contractors in Koala of St. Paul. Schedule a free quote with us today!
In 5 Easy Steps

Enhanced Comfort
Stay cozy inside, no matter the weather outside.

Energy Savings
Save on your energy bills while keeping your home comfy all year.
Reduced Noise
We use top-quality insulation to give you lasting results.

Eco Friendly
Choose insulation that’s better for your home and the planet, such as solar-powered attic fans.
Your Satisfaction is
Our Top Priority
And don’t just take our word for it, hear from our happy clients about their experience with our professional insulation services.
Ready to get your project started? Work with the most experienced spray foam insulation contractors in Koala of St. Paul. Schedule a free quote with us today!
Frequently Asked Questions
Spray Foam Insulation FAQs
Get all your questions answered by our local experts. If we didn’t address your question here, give us a call at (651) 272-2720 or schedule a free quote today!
Is spray foam right for my attic in St. Paul?
Spray foam insulation can be an excellent choice for attics, but there are a few key factors to consider:
Moisture and Preparation: Any existing dampness or water intrusion should be resolved before installation to ensure strong adhesion and long-term performance.
Surface Readiness: Concrete or masonry walls may need light cleaning or preparation so the foam bonds evenly and seals effectively.
By addressing these factors, spray foam creates a dry, comfortable, and energy-efficient environment that helps protect your home from the ground up. When applied by certified Koala Insulation professionals, spray foam provides lasting comfort, reduced energy costs, and year-round peace of mind. Learn More

How much does spray foam insulation cost in St. Paul?
There are several factors that affect the cost of spray foam insulation. In St. Paul and most cities, insulation costs vary based on the amount of material required (based on square footage), the need to remove existing insulation, and the complexity of the project.
- Small attic (Less than 500 square feet): $1,000 to $2,000
- Medium attic (1,000 square feet): $2,000 to $5,000
- Large attic (2,000 square feet): $4,000 to $8,000
Get a free quote for the most accurate assessment and a personalized quote.
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Is spray foam right for my basement in St. Paul?
Spray foam insulation is an excellent option for basements, offering both energy savings and moisture control. Here are a few important considerations:
Moisture and Preparation: Any existing dampness or water intrusion should be resolved before installation to ensure strong adhesion and long-term performance.
Surface Readiness: Concrete or masonry walls may need light cleaning or preparation so the foam bonds evenly and seals effectively.
By addressing these factors, spray foam creates a dry, comfortable, and energy-efficient environment that helps protect your home from the ground up. When applied by certified Koala Insulation professionals, spray foam provides lasting comfort, reduced energy costs, and year-round peace of mind. Learn More

How much does basement spray foam installation cost in St. Paul?
The cost to insulate a basement with spray foam depends on the size of the area, existing insulation, and project complexity.
Small basement (≈500 sq ft): $1,200 – $2,800
Medium basement (≈1,000 sq ft): $2,400 – $5,600
Large basement (≈2,000+ sq ft): $4,800 – $9,000
Spray foam insulation helps eliminate drafts and moisture, providing a more comfortable, energy-efficient lower level. Pricing per square foot may increase if your basement requires old insulation removal, foundation wall prep, or hard-to-reach rim joists.
Every home is different. For a detailed estimate tailored to your basement’s layout and energy goals, contact team today for a free assessment. Learn More
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Should I insulate my basement ceiling with spray foam?
Closed-cell spray foam works best for basement ceilings because it provides a high R-value and acts as a moisture barrier. It can also help block sound between floors. For the best results, it’s important to assess your home’s layout, HVAC design, and moisture conditions before choosing where to apply spray foam.
Koala Insulation technicians can evaluate your space and recommend whether ceiling, wall, or rim-joist insulation will deliver the greatest comfort and energy savings for your home.
Is spray foam insulation safe?
Spray foam insulation is safe when handled and installed by a trained professional. Spray foam poses no health risk once it is cured, but it can be hazardous during installation due to its chemical composition. We follow all industry safety standards, ensure proper ventilation, and complete curing before occupants return to the space, usually 24-48 hours after project completion.
Will spray foam help with the mold and mildew issues in my basement?
Closed-cell spray foam works best for basement ceilings because it provides a high R-value and acts as a moisture barrier. It can also help block sound between floors. For the best results, it’s important to assess your home’s layout, HVAC design, and moisture conditions before choosing where to apply spray foam. The cost to insulate a basement with spray foam depends on the size of the area, existing insulation, and project complexity.
Koala Insulation technicians can evaluate your space and recommend whether ceiling, wall, or rim-joist insulation will deliver the greatest comfort and energy savings for your home.

Mold and Mildew Removalwith Koala Insulation
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Can you insulate the concrete block walls in my basement?
Concrete block basement walls can be insulated with spray foam, provided the surface is clean, dry, and free of moisture issues. Closed-cell spray foam is typically best, as it both insulates and creates a moisture-resistant air seal that helps prevent mold and drafts. Before application, any existing leaks or dampness should be addressed to ensure long-term performance and adhesion.
At Koala Insulation, we’ll determine whether spray foam, rigid foam board, or a hybrid system is the best fit for your block-wall basement so you get a solution built for long-term performance.

Do My Rim Joists Need An Airtight Seal?
Rim joists absolutely benefit from an airtight seal. Sealing this area with spray foam insulation prevents drafts, moisture intrusion, and heat loss where the foundation meets the framing, one of the most common sources of energy waste in a home. By creating a continuous air barrier, you’ll enjoy warmer floors, lower utility bills, and better indoor air quality year-round.
Learn more about rim joist insulation and contact your local Koala Insulation contractor today.

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Is spray foam insulation flammable?
Spray foam insulation itself is not flammable once fully cured, but like most building materials, it can burn when exposed to direct flame. Koala Insulation uses fire-rated, code-compliant products. When installed correctly by our certified technicians, spray foam insulation provides a safe, durable, and energy-efficient layer that meets modern fire safety standards.

Can you paint spray foam insulation?
Spray foam insulation itself is not flammable once fully cured, but like most building materials, it can burn when exposed to direct flame. Koala Insulation uses fire-rated, code-compliant products. When installed correctly by our certified technicians, spray foam insulation provides a safe, durable, and energy-efficient layer that meets modern fire safety standards.

How long does spray foam insulation last?
Spray foam insulation typically lasts 80 to 100 years when professionally installed and properly maintained. Spray foam adheres directly to the building structure and won’t sag or settle, which means it offers the same performance decade after decade.
What are the best applications for spray foam insulation?
Spray foam insulation is a premium, versatile option for a few specific applications. After your initial assessment, we may recommend spray foam for:
Attics: Open-cell spray foam on attic floors seals air leaks and prevents treated air in the living space from escaping into the attic.
Basements: Closed-cell spray foam acts as a vapor barrier in moisture-prone basements, crawl spaces, and cellars.
Exterior Walls: While not always necessarily the most cost-effective option, spray foam fills irregular gaps in wall cavities while providing an effective moisture barrier.
Floors: Spray foam is sometimes sprayed between floor joists in suspended timber floors (non-slab).
Roofs: Closed-cell spray foam installed under the roof deck prevents air leaks and protects against moisture issues.
Can I spray foam insulation myself?
While DIY kits exist, spray foam insulation is not a good do-it-yourself project. Professional installers have the training, equipment, and ventilation controls needed to ensure safety, proper curing, and compliance with building codes. Poor installation from DIY attempts can lead to moisture problems, off-ratio foam, or even voided home insurance coverage, making professional service from Koala Insulation technicians the smarter, safer choice.

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