Insulation

Insulation is the material that helps regulate your home's temperature by slowing heat transfer through walls, attics, and floors. Whether you're upgrading old fiberglass batts, sealing air leaks, or exploring spray foam options, the right insulation keeps energy bills down and comfort up year-round. Angi connects you with local pros who can assess your needs and provides resources to guide every step of your project.

Related to Insulation Service

Insulation Service Articles and Advice
Kate Fann  •  Jul 15, 2026
Open-Cell Foam vs. Closed-Cell Foam Insulation: What's the Difference?
Insulating your home with a quality product is not a decision to be taken lightly. Compare open-cell foam versus closed-cell foam insulation to find the best solution.
Kate Fann  •  Jul 15, 2026
Breaking Down R-Values: A Key Factor in Choosing the Right Insulation
The insulation R-value can make all the difference in keeping your home insulated, but it depends on where you live. Keep reading to learn about R-values.
Allie Ogletree  •  Jul 15, 2026
What Is the Best Insulation for Your Basement?
The best insulation for your basement depends on the insulation location, budget, and climate. Here’s what you need to know about insulation for basements.
Haley Nothstein  •  Jul 15, 2026
How Much Does It Cost to Soundproof a Room? [2026 Data]
Whether you’re trying to keep noise in or out, soundproofing materials are the way to go. Use this guide to see how much it costs to soundproof a room.
Allie Ogletree  •  Jul 15, 2026
Should You Remove Old Insulation Before Adding New Insulation?
Removing old insulation may be necessary for upgrading your insulation. Keep reading to see if you should remove old insulation before adding new insulation.
Amy Freeman  •  Jul 10, 2026
Cellulose vs. Vermiculite Insulation: What's the Difference?​
What's keeping your home warm? Learn the differences between cellulose vs. vermiculite insulation and why it matters.
Amy Freeman  •  Jul 10, 2026
EPS vs. XPS Insulation: What's the Difference and Which One Is Right for You?
EPS versus XPS insulation—if you're going the foam board insulation route, which one is right for you? Learn the difference and how to choose.
Melissa Graham  •  Jul 10, 2026
How Much Does It Cost to Insulate a Basement? [2026 Data]
The cost to insulate a basement varies based on materials, size, and other factors, as well as how much of the work you wish to perform yourself.
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Common Insulation Service Questions

Once installed, injection insulation requires little maintenance, but periodic inspections for air leaks or moisture buildup are recommended.

Polyisocyanurate foam, or polyiso for short, has the highest R-value per square inch: 6.5 to 6.8. Polyiso is a rigid foam that comes with a reflective foil on both sides to serve as a radiant barrier. Given its high R-value, rigid foam is usually meant for foundations and basement walls.

Caulking around a sill plate can be a good way to reduce drafts and heat loss through the small gaps between the sill plate and the foundation and between the sill plate and the framing lumber above, so it’s normally a good idea. If you’re having your sill plate replaced, ask your contractor to use a sealant between the foundation and the sill plate for the best results. If your sill plate is already installed, simply caulk the visible gaps on either side of the sill plate.

Spray foam insulation can last between 80 and 100 years, depending on the type. Closed-cell spray foam is more durable, while open-cell foam is more susceptible to moisture damage and deterioration. It's important to consult a professional installer to understand which type of foam will be used and its specific longevity. Additionally, be aware that some spray foams can damage plastic piping, so if you have PVC or CPVC pipes, discuss this with your installer.

A green home is one that focuses on conservation, with the goal often being net-zero carbon emissions and self-sustainability. It will often include some kind of self-generation equipment, like solar panels or a small wind turbine, high-efficiency electrical components and mechanicals, and high-quality insulation and air sealing to reduce the loss of conditioned air. Many green homes also include xeriscaping or rainwater collection to cut down on drainage and water consumption.