The Most Popular Garage Insulation Types

Ben Kissam
Written by Ben Kissam
Updated August 27, 2021
Interior of organized garage
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Stay warm, reduce energy costs, and (maybe) even muffle sounds in your garage

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A variety of materials, and even installation methods, can help regulate temps in your garage. However, as a homeowner, it might be challenging to figure out which type of garage insulation is right for you.

Fiberglass and foam board insulation both work well if you’re planning to reinforce all the walls in your garage or if you just want to reduce noise. But other selections, like spray foam or radiant barrier, could be a better fit depending on your home’s layout and your climate. This guide will help you choose the right insulation for your garage.

Fiberglass Insulation

Fiberglass garage insulation is one of the best types of insulation because it’s affordable and flexible. Made from reinforced plastic, fiberglass can significantly affect heating your garage, conserving up to 12 times as much energy in your home and reducing energy costs up to 40 percent. It also offers natural soundproofing benefits.

Batt insulation, a type of blanket insulation available in pre-cut rolls, is typically made from fiberglass. This is perhaps the most common type of garage insulation you’ll find in a home. On average, insulation installation costs a little over $2,000.

Cellulose Insulation

Cellulose uses recycled paper products to insulate your garage and reduce noise. 

It doesn’t lose its R-value (insulation abilities) in extremely cold temperatures. It also does a great job of keeping insects out of your home.

Made from plant fibers, cotton, or wood and often manufactured using recycled materials, this material could reduce your insulation’s carbon footprint

Cellulose is technically mold-resistant, although due to its placement (it sits right against drywall and wooden studs), it could be susceptible to mold growth if exposed to water. A top-rated insulation contractor can give you peace of mind when installing cellulose in your walls.

Spray Foam Insulation

Made from polyurethane plastic, spray foam offers an affordable and easy-to-administer option for insulating your garage. This material expands and hardens, sealing off cracks or areas exposed to the elements that may let heat or cold air escape. It’s one of the best options if you’re just trying to insulate one area of your garage or have a living space that’s difficult to access.

It’s long-lasting, too: Many manufacturers say Spray foam installation can last between 50 and 80 years.

That said, spraying the foam yourself isn’t for everyone, especially if you’re prone to allergies or have asthma. The average spray foam insulation cost is about $2,500 but could save you from taxing your respiratory system.

Blown-In Insulation

Vehicle parked in garage with workbench
Kirill Gorlov -

As the name suggests, Blown-in insulation is a type of insulation that is blown into areas where cold air, weather, or insects could creep into your home. 

This type of garage insulation is typically made from cellulose or fiberglass. Cellulose, because it’s made from recycled materials, is the more budget-friendly option.

A local blown-in insulation expert can install this material that lasts up to 25 years when applied correctly.

Foam Board Insulation

Foam board insulation for your garage is made from PVC (polyvinyl chloride) or styrofoam (polystyrene). It’s typical sold in 4’ x 8’ sheets and is sometimes referred to as rigid foam insulation.

Depending on the type of foam you choose, the R-Value of foam board insulation will range between 4 and 6 per inch of thickness. It’s a popular alternative to fiberglass because it’s easy to install and water, corrosion, and fire-resistant.

Structural Insulated Panels

Structural insulated panels (SIPs) are high-performance insulation used for homes instead of traditional wood framing. They can be used to insulate a roof or walls and are often placed in commercial buildings. Like fiberglass, SIPs also offer natural soundproofing.

SIPs cost more than traditional framing methods but take far less time to install, which could save you money. They can also help save on energy costs.

Radiant Barriers and Reflective Systems

Commonly used in warm weather climates, radiant barriers and reflective systems prevent heat from absorbing into your home instead of reflecting it away.

Installing radiant barrier insulation could cost as much as $2,840. A professional typically charges between $30 and $80 per hour.

This type of garage insulation is most commonly used in attics but could be an especially attractive option if your garage has a loft above it.

Garage Door Insulation

In some cases, a homeowner may choose to simply add insulation to the garage door. A standard garage door could have as low an R-Value as 6 (13 or higher is recommended for keeping warm or cool air inside). Reinforcing this area of your garage could help keep costs down.

In this case, foam board or reflective barrier insulation are probably your best bets.

Best Type of Garage Insulation

The best type of garage insulation for your home will come down to what’s already in place, your budget, and how insulated you’d like your garage to be. 

Fiberglass or cellulose can muffle noises and insulate drywall. But if there are just small gaps to fill or a draft coming in from one area, a more targeted solution, such as spray foam or blown-in insulation, could be the better fit.

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