Insulate Your Garage to Save Energy and Lower Your Bills

Garages often go overlooked when it comes to energy conservation, but insulation them can actually save you money. Not only does it lower your bills, but it also keeps the garage warm and comfortable for …

Garages often go overlooked when it comes to energy conservation, but insulation them can actually save you money. Not only does it lower your bills, but it also keeps the garage warm and comfortable for you and your family members.

Insulating garages offers several options, such as fiberglass, cellulose and rigid foam. All of these materials can be utilized to insulate the walls and ceiling of your garage.


Fiberglass insulation is a popular garage insulation choice due to its affordability and pre-cut batts that fit easily between joists or studs.

Installing garage door insulation also comes in rigid panels, which are convenient and often provide an impressive R-value per inch. These can be inserted between studs or joists or attached to your garage door panels using construction adhesive.

Insulating your garage is a great way to maintain the temperature inside your home and cut down on energy costs. Additionally, it reduces noise transfer from outside sources.

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Cellulose insulation is one of the greenest forms of garage insulation, made from recycled paper – usually post-consumer waste newsprint – treated with fire retardants and insect repellents.

Insulation works by slowing the passage of heat and cool air through walls and ceilings, helping to reduce energy costs. It also reduces outside noise levels and enhances comfort in a space.

Blown-in cellulose insulation is one of the most common types of garage insulation, but it’s best to hire an insulator for this job. It’s cheaper than fiberglass and can be blown into walls and ceilings without needing drywall installation.

Another popular form of cellulose garage insulation is spray-applied cellulose, which utilizes a water and bonding agent combination to create an even tighter seal against air infiltration. It’s perfect for new construction as well as re-insulating old or improperly insulated walls and attics; however, applying this material requires special equipment and expertise.

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Rigid Foam

If you’re in need of garage insulation, there are a few materials to choose from. One popular type is rigid foam – perfect for keeping the heat inside while providing excellent soundproofing.

Insulation with R-values ranging from R4.5 to R5.0 per inch is available in various thicknesses and profiles.

It is recommended for use on walls and ceilings to prevent heat loss and enhance temperature control in your garage. Not only will it improve energy bills, but it can also reduce air leakage, condensation, and mildew build-up.

Polyisocyanurate (ISO) rigid foam is often used in industrial applications but can also be found in residential homes. With R-values ranging from R7.0 to R8.0 per inch and their reflective foil facing, ISO materials help seal insulated areas and minimize energy losses.

Add insulation to your garage floor by placing a vapor barrier over the concrete slab, followed by foam panels. Finally, cover this layer with plywood sheets for extra protection.

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Spray Foam

Spray foam insulation is an inexpensive and simple DIY project that can significantly reduce your garage ceiling’s heat loss.

Garage insulation designed for finished ceilings can also be used on vaulted ceilings if your garage has a crawl space above. While more costly than fiberglass and cellulose alternatives, this insulation offers superior R-value.

Garage carpet spray-on insulation can be applied around the garage or blown into it, as well as over existing insulated garage walls.

Spray foam garage insulation not only provides superior insulation, but it’s great for air sealing too. It creates a tight seal that blocks out drafts and keeps your garage as comfortable as possible.

Mold, allergens and rodent excrement (gag) should all be prevented with this spray. Be mindful not to breathe in fumes while spraying; wear protective clothing and use a respirator for best results.