How To Insulate A Garage

Here’s how to insulate a garage including what you’ll need for insulating walls, doors, and ceilings, types of insulation, and other important details.
Garage under construction with exposed ceiling insulation, concrete floor, tracked doors, and windows The garage is frequently utilized for purposes other than parking your vehicles, seasonal objects, equipment, and lawnmowers. Numerous homeowners leverage the ample capacity to build a functioning workshop, mudroom, game room, etc.

Nonetheless, every summer, the garage may rapidly transform into an immense oven that gets increasingly unpleasant as the temperature increases. And in the winter, it could be too freezing to occupy.

Fortunately, efficient insulation assists in blocking heat that flows into and out of the area, keeping it pleasant in the summertime and warmer in the wintertime. It can also reduce outdoor sounds, such as cars or noisy neighbors. 

For expert do-it-yourselfers, insulating an undeveloped garage may be a relatively straightforward process. Continue reading for step-by-step instructions on how to protect your garage from frigid winters and scorching summers.

What You Need Before The Insulation Process

Materials needed to insulate a house garage If you are performing your own garage insulation, you must always follow these suitable preventive measures:

Wear a face mask to keep insulating substances out of your airways.

Constantly use safety glasses when working with spray-type or blow-in insulation.

When working with insulating materials, gloves must be used.

It is important to invest in scaffolding or ladders to ensure your safety and the seamless completion of the job.

Apply a vapor barrier to keep moisture from collecting on the insulation surface.

Be certain that the electrical boxes mounted on the garage ceiling are not covered. Moreover, do not tighten the insulation surrounding the boxes.

To avoid damage to your wall insulation, eliminate all hanging objects.

To minimize water damage and mold development, any cracks, fissures, or openings in the outer wall must be fixed before putting in the insulation.

Here are the things you will need during the process of insulating your garage:

Face mask

Eye goggles


Insulation of your choice

Ladder or scaffolding

Staple gun

Vapor barrier

Expanding foam

Retainer pins

Sealant gun

Drywall or plywood

Drywall screws

Utility screws

Drill driver


Screwdriver set


Edging strips

Utility screws

Drill driver


Screwdriver set

Garage Wall Insulation 

Garage with insulated walls and concrete sealed floor Garage walls are generally inadequately insulated, particularly if your garage is detached from the remainder of your home. Hence, if you intend to use your garage for purposes apart from storing your vehicle, you must invest in wall insulation. 

Uninsulated walls might disrupt the cooling or heating process within your garage. Fiberglass foam insulation is a better choice for garage walls.

Without further ado, here are the steps on how you can insulate your garage walls:

How To Insulate Garage Walls

Garage walls with insulation Detach everything that is affixed to your garage walls: Screws, nails, and clips are typically put on a garage’s wooden studs so that gardening equipment, ladders, as well as other items can be hung on the walls while not in operation. 

A hammer or screwdriver is usually all that is required to dislodge any hooks, screws, nails, or other attachments that are fastened to the garage walls to gain access to the wall’s underlying studs. Moreover, make sure to clean your garage walls before insulating them.

Ensure to seal existing holes or gaps in the exterior garage wall: Scrutinize both the exterior and interior of your garage for any cracks or gaps. Moreover, it is indeed a smart idea to check for any cracks or holes in the adjoining wall with the house. 

Pests as well as other insects can enter via these thin openings, and water can trigger the hole or crack to spread, leading to mold formation and persistent moisture disruption within your garage.

Seal any fissures, holes, or gaps with watertight brickwork sealant with a caulking tool. Before applying insulation, let the sealant dry and solidify as per the manufacturer’s instructions.

Mount fiberglass insulation batts between wall studs and ascertain to cut them to conform odd gaps: Once the garage walls are adequately sealed and free of any screws, nails, hooks, or other mounted objects, the insulation may now be installed. 

Because of their flexibility and low cost, fiberglass batts and solid panel insulation are the most widely employed choices.

Rather than pushing the insulation to fit the area, insert it into the crevices between the studs and trim it to size using a sharp multipurpose knife.

After you have finished the insulation process, add a vapor barrier above the insulation and fasten it with staples for added durability: Laying a vapor barrier to the warmer surface of the insulation protects it, the studs, and the external wall surface against problems associated with excessive moisture, such as decay and mold development.

In temperate areas, the vapor barrier is stapled to the wall studs and placed over the insulation on the interior surface. 

Nonetheless, it is critical that the vapor barrier not be broken since any openings might contain moisture and exacerbate issues within the garage walls.

Start installing the drywall: Once the insulation and vapor barrier are completed, the project is closely finished, and your garage is now protected from different atmospheric conditions. 

Nevertheless, the area could be improved with polished and well-finished garage walls.

Start measuring the walls to determine how many layers of drywall, adhesive, and drywall solution are required to make the area into a finished setting. 

Afterward, make a preliminary plan for the design. Start hanging the drywall after double-checking all of the measurements.

With drywall screws, attach the drywall sheets onto the garage wall studs and continue until all of the walls are entirely covered. 

To achieve a seamless surface, tape, and mud the drywall, then sand the drywall substance. Lastly, the walls could be painted to wrap up your garage renovation.

Garage Door Insulation

Garage door with smalll windows and a concrete driveway Insulating your garage door could keep your garage interior much cooler in the summertime and substantially warmer during the wintertime.

Completely insulated doors are commercially available, but they are somewhat costly. Nonetheless, you may save funds and reduce energy waste by constructing it yourself. In hot climates, solid panels with reflective foil can be used to divert heat away.

Applying insulation on your garage door would be complex since there are no supports to secure the insulation in position. 

Alternatively, adhesive retainer hooks would be required to keep the insulation intact. However, here are the steps on how you can insulate your garage doors.

How to Insulate a Garage Door

Empty residential garage with door opener and concrete floor1. Using cleaning solutions, sanitize and wipe the entire door surface.

2. Every panel’s width and height should be measured because they may vary greatly in size.

3. Trim the insulation to size by following the instructions measurements.

4. Locate a position 12 inches away from the panel’s border and halfway between the lateral slats.

5. Afterward, insert and push the retainer pin into the panel.  In every panel, insert two retainer pins.

6. After that, lay the insulation on the panel and press it against the retaining pin.  Put the pin cover on top of the pin. 

7. Do the same process on the remaining panels.

8. Apply the weather protection above the insulation and seal it with nails afterward.

9. Check the operation of your door. If you raise it and then release it, it must stay in position.

10. If it is not properly fastened and goes off, contact a door servicing professional to have it adjusted.

Garage Ceiling Insulation 

Exposed garage ceiling with foil for insulation Efficient insulation for your garage ceiling is undoubtedly required to decrease energy waste, particularly during the cold winter months. Heated air flows upward, and if zero insulation is present, all of the warmth will be dissipated through fractures and crevices in the ceiling.

The ceiling can usually be insulated in the same way as your garage walls. However, you will normally need at least two individuals – one who is up on the ladder and the other one who is nearby to handle insulation, distribute tools, and stabilize the ladder. 

Here are the basic steps on how you can insulate the usual ceiling design types found inside a garage.

How To Insulate A Garage Ceiling 

Empty garage with sealed floor, door, ceiling light, and wood bench1. Get your ladder or scaffolding ready. If you’re using a ladder, request the assistance of a household member or a friend.

2. Acquire some measurements. Take measurements of the garage ceiling’s width and length. The area is therefore calculated by multiplying the length by width. Furthermore, measure the space between the joists and their depth. They are typically 8 to10 inches deep.

3. Furthermore, measure the space between the joists and their depth. They are typically 8 to 10 inches deep.

4. Trim the insulating layer as per your measurements.

5. Apply the insulation and fasten it with a nail gun in the ceiling.

6. If any corners remain, trim the insulation to fit them properly. To cover up the spaces, you may alternatively use expanding foam.

7. Plaster the ceiling with plywood or drywall to complete the project.

Different Types of Insulation You Can Install in Your Garage

Insulation material being added to garage wall by contractor Fiberglass Garage Insulation: This is the most common form of insulation found in residences, particularly in garages. 

Fiberglass insulation is the least expensive and simplest to construct, rendering it an excellent choice for a do-it-yourself operation. Fiber insulation is available in the following forms:

Bats and blankets to match the wall frames and studs in your garage’s ceiling and flooring. Loose-fill fiberglass could be pushed into position, which is exceptionally useful for sealing gaps in ceilings and walls. 

If your garage’s attic, for instance, has vacant space atop the ceiling, it may be successfully employed to cover it.

Moreover, you may rent specialized equipment to blast it in, or you can pour it in manually. However, performing it manually will take a lot of time and effort.

Rigid Foam Garage Insulation: Rigid foam-based garage insulation is a popular alternative for garage doors and slender walls. 

This is not, unfortunately, appropriate for solid walls or floors. It is also suitable for do-it-yourself projects. If you want to remodel your garage and incorporate insulation sheets, this would be an ideal option, to begin with.

Cellulose Garage Insulation: Cellulose insulation is constructed of recyclable materials that have been chemically processed to make it fire-resistant. 

The material is then blasted into holes and gaps using blowing equipment. Because it is loose-fill insulation, it is only suitable for finished areas. It is suitable for use on the completed garage walls and ceiling.

Spray Foam Garage Insulation: Spray foam insulation performs effectively in terms of air sealing. It is costly, and it must only be used in a garage if you intend to utilize it as a living area. 

You may only use it to fill in nooks and corners. This insulation provides the highest-quality air sealing, energy efficiency, robustness, lifespan, and R-value.

Radiant Barriers and Reflective Garage Insulation Systems: Such insulation solutions function by reflecting heat and could maintain a room’s coolness in the summertime even with the absence of an air conditioner. 

They are, meanwhile, distinct from other forms of insulation in that an R-value does not assess their efficiency. 

Aside from that, they are covered with aluminum foil to provide a reflective barrier. It may be used to reflect heat on garage doors. Plus, they are particularly beneficial for attic insulation in tropical climates.

Best Insulation for Garage 

Exposed garage wall with insulation In Terms of Efficiency, Durability, and Longevity – Spray Foam Insulation: Spray foam insulation has great R-value attributes and it also has exceptional air sealing capabilities. 

Spray foam insulation is a higher-end insulating material that is more costly but also extremely energy efficient. Indeed, this would be the best option in terms of longevity, durability, and efficiency, making your garage properly and effectively insulated.

In Terms of Affordability, Ease of Installation, and Popularity – Fiberglass Insulation: Fiberglass is undoubtedly the most common garage insulation option nowadays. It is made out of rolls that are exactly trimmed to fit into a ceiling or wall opening and then fastened in place.

It is so popular since it’s affordable and most people can install it themselves. So, in terms of cost and ease of installation, this type of garage insulation would be the best option.

Does Insulating a Garage Keep it Cooler?

Contractor adding insulation to garage walls Arguably, the answer would be yes. Garage insulation is a significant cooling component. The majority of garages lack appropriate insulation, even if one is constructed at all. If you use air conditioning in your garage, this involves considerable downsides.

However, proper insulation will greatly minimize the amount of heat transported from the outdoors to the interior of your garage. Insulation will help prevent cool air from fleeing. 

Otherwise, your air conditioning technology has to work much harder, your electricity bill rises, and it will take much longer to cool the garage.

To minimize interior heat, try adding insulation to your garage’s walls, ceiling, and doors. When it comes to maintaining the proper temperature inside your garage, the type of insulating material you use could make a great difference. 

Such insulation upgrades will benefit you all year long by lowering your heating and air conditioning expenditures and increasing the value of your property.

What is the Easiest Way to Insulate a Garage?

Contractor inserting insulation material into garage ceiling Using fiberglass roll insulation is the easiest way to insulate your garage. In fact, if your garage’s inner walls have not yet been built, this would be the most inexpensive and quickest type to install.

All you have to do is unroll the insulation between the wall studs, ensuring that the vapor barrier faces the interior of your garage. Place 1/2-inch nails every 2 feet around the border of the insulation into the studs with a nail gun to keep it secure.

Unroll the insulation between the joists and let it rest flat if you are dealing with attics and horizontal surfaces; no fasteners are required. It is critical not to compress and stretch the fiberglass roll insulation as this will reduce its insulating efficacy.

Is it Worth Insulating an Attached Garage?

House with attached garage dormers pitched roof driveway and front lawn Yes. Insulating your attached garage will improve the energy efficiency of your house and minimize your power costs. 

Even if you have a well-insulated attached garage, it may act as a buffer barrier for your home, safeguarding the interior temperature and boosting the level of comfort of all garage-connected rooms. 

Your house will lose more hot and cooled air if your attached garage is not properly insulated.

Is it Worth Insulating a Detached Garage?

Detached garage with a concrete driveway and pavers next to a house Yes. In fact, insulating your garage is not that expensive. Moreover, it has a slew of other benefits that, when weighed against the low cost, make it an excellent idea and worth the investment. Insulated types of garages revamps general comfort regardless of the weather. 

Insulation can also safeguard anything stored in your garage. Additionally, whether you use the garage as a leisure or a hobby room, you could work and enjoy more comfort all year. Even going to the detached garage to grab anything from storage would be a highly enjoyable activity.

It is Time to Insulate your Garage

Empty garage with door openers, ceiling lights, and sealed floorThe installation of insulation to your garage protects the area from drastic temperature fluctuations, allowing homeowners and guests to enjoy the garage during the wintertime or the scorching heat of summer.

It is essential to bear in mind, therefore, that any fasteners and other hanging items must be removed to avoid damage to the insulation.

Any cracks, holes, or crevices in the exterior garage wall must be repaired before placing the insulation to avert insect infestations, moisture-related damage, decaying, and mold formation. 

To preserve the longevity and efficiency of your garage, well, it is time to insulate it. Just follow the guidelines aforementioned, and you are good to go.

See more related content in our article about the types of garage lighting on this page.

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Written by Khaycelyn - Author

Khaycelyn Dimaano is a Bachelor of Science and Information Technology graduate who pursues her dream to work from home as a skilled interior design writer.

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