Knowledge Builders

should a garage attic be insulated

by Jeramie Armstrong Published 1 year ago Updated 7 months ago

If your home's HVAC system does extend into the garage, then the attic above it should be insulated as it would for any other room of the house. This will serve the same function of keeping hot or cold air inside the garage as it does for the rest of the house.Oct 12, 2016

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How to insulate a room above the garage?

Tips to Keep a Garage Add-On Warm

  • Carpeting. Having wall-to-wall carpeting can help to keep a room substantially warmer. ...
  • Rugs. If you don’t want to install carpeting, thick rugs can do the trick. ...
  • Window furnishings. Try implementing heavy drapery or curtains. ...
  • Heaters/fireplaces. The simplest solution is to buy a space heater or an electric fireplace. ...
  • Fiberglass batts. ...

What is the best insulation in an attic?

  • BEST OVERALL: Owens Corning R-38 Kraft Faced Fiberglass Insulation
  • BEST BANG FOR THE BUCK: Frost King CF1 “No Itch” Natural Cotton Insulation
  • BEST BLANKET: Owens Corning R-30 EcoTouch Fiberglass Insulation
  • BEST SPRAY FOAM: FROTH-PAK 620 Sealant – 2 Component Foam Insulation
  • BEST RADIANT FOIL: US Energy Products Double Bubble Foil Insulation

More items...

Should I insulate my garage attic?

Yes, you should insulate your detached garage if:

  • Your current detached garage doesn’t have insulation
  • Your detached garage is too hot or too cold
  • You want to cool the detached garage space down to use it for other purposes

Can you put insulation over insulation in your attic?

Yes, you absolutely can. You can lay insulation around the junction boxes as well. Making sure that the insulation is of a fiberglass material will not only ensure a fireproof setup but also reduce airflow from the home through the attic. Let’s take a look at what’s involved with insulation around your electrical wires in the attic. Insulation In The Attic. Understanding what type of insulation to use in your attic is key as to whether or not it can cover electrical wiring.


Is it worth insulating a garage ceiling?

An insulated ceiling is especially important if you've got a living space above the garage. During the summer, the heat's inexorable journey upwards will find it creeping into the room above, undermining the air conditioning and raising its costs. Winters, in turn, will be cold and drafty.

What is the best insulation for a garage attic?

Fiberglass is the most commonly used type of insulation in garages (just as it's the most popular type in homes). It's sold in precut batts and long blankets that fit between wall studs and ceiling joists.

Should you insulate above an unheated garage?

Most homeowners leave their unheated garages uninsulated, which is fine since they don't need to maintain the temperature in that space anyway. If you have a bonus room, however, insulation becomes necessary even if you're not heating your garage.

How do I insulate attic space over garage?

1:2610:49Insulating a Garage Attic - YouTubeYouTubeStart of suggested clipEnd of suggested clipHere you just want to cut a tee you cut it line straight down where it goes across then i t acrossMoreHere you just want to cut a tee you cut it line straight down where it goes across then i t across left to right and it'll go wrap. Around each one of these posts as you go up when you're all. Done.

Will insulating my garage ceiling keep it cooler?

Garage insulation is a key cooling factor Proper insulation will significantly reduce the amount of heat transferred from your garage's exterior to its interior. Insulation will also keep the cool air from your air conditioner from escaping outside.

Should you insulate attic roof rafters?

Insulating between rafters will do no good, because the attic should be ventilated, and the rafter insulation would be between two unheated spaces. You can add insulation to the floor; the more the merrier. Just don't put it in the eaves. Also, make sure the attic is well ventilated.

Is adding insulation to attic worth it?

Installing attic insulation this winter is a worthwhile long-term investment because it can significantly decrease your heating bills. As an added benefit, when the hot D.C. temperatures come back, the attic insulation will also minimize your air conditioning bills.

Does insulating a garage make a difference?

If you are looking to reduce your energy costs, the best bet is to put time and energy into insulating the attic space over your attached garage. This helps balance the temperature in that part of your house. Unfortunately, insulating your garage will not make much of a difference with your energy bills.

Can insulating a garage cause mildew?

Poor or inadequate insulation in your garage can lead to condensation issues due to temperature differences, which leads to the growth of mold and mildew. Fiberglass and cellulose will retain moisture, which can lead to problems with not only mold and mildew, but wood rot as well.

Should I insulate my garage roof?

Sure you can and it is very important to insulate the ceiling of your garage. This is particularly important for the warmer and cooler months. The insulation will keep the heat trapped in your home and allow you to save on your heating bill, during the cooler months.

Should I insulate an unheated detached garage?

The bottom line is that insulating even an unheated detached garage can make it better by making it more livable and prolonging the life of your car and other precious belongings. It does not cost much and you can do it yourself.

How much does it cost to insulate above garage?

How Much Does It Cost to Insulate a Garage? Garage insulation costs vary based on the size of the space and the insulation you purchase. Sebring estimates it costs about 50 cents to $1.25 per square foot to insulate a garage. This means insulating a two-car garage would cost about $338 - $845.

What R-value insulation should I use in my garage?

Exterior Garage Walls Typically these will be constructed from standard 2-by-4 studs which will define the amount of insulation that you can have installed. You should be targeting an R-Value of R-13 or R-15 in these areas to properly maximize your insulation in this application.

Is R-19 insulation Good for garage ceiling?

If my garage ceiling wasn't insulated, all that heat would rise to my bedroom and my AC bill would be much higher. R-19 insulation is suitable for floors/ceilings in most homes, unless it's the highest ceiling in a house.

What is the best material for a garage ceiling?

One of the most popular garage ceiling materials is drywall. It is notable for its seamless look and also for the fact that it is easy to use. Likewise, it is easy to maintain as it can be patched when there is damage. Most especially, drywall is pocket-friendly and has an insulative property.

How much insulation should I put in my garage ceiling?

While some ceilings in the southwestern part of the United States require a minimum of R-19 insulation, most attics or ceiling areas require a minimum of R-38 in the ceiling.

Why is it important to insulate a garage?

It is important to insulate any walls that separate the garage from air-conditioned rooms in the house. If these walls are not insulated, the temperature of the garage can affect the rooms and make the house’s heating and cooling system work harder to compensate. Weatherize and seal. Protecting your garage and the valuable things inside it makes ...

How to protect your home from the elements?

Install a storm door between the garage and the house to protect your home against the elements, and seal any gaps that may allow wind or rain into the garage. Insulating the attic above a garage that is not connected to an HVAC system has no appreciable effect on home energy bills.

Does insulation help in the garage?

The insulation will keep the naturally hot or cold air in the garage and the artificially warmed or cooled air in the room above it. If someone spends a lot of time in the garage, insulating it may improve their comfort, even if it doesn’t lower any bills.

Does insulate the garage attic lower energy costs?

The general answer to the question of whether insulating a garage attic will lower energy costs is no, at least not appreciably. Since your home’s heating and cooling system usually does not extend into the garage, insulating this area does little to change the cost of running the system.

Why insulate a home?

The primary reason to insulate any part of the home is to provide a thermal barrier between conditioned (heated or cooled) interior space and the outdoors or unheated spaces , such as an unfinished attic.

Is it better to insulate the ceiling of an unconditioned garage?

Unconditioned Garage. In general, if you're not heating or cooling your garage, there is little benefit to insulating the ceiling because there's no costly heated or cooled air to keep in. However, if your attic gets very hot in the summer, insulating the ceiling may reduce some of the heat transferred from the attic to ...

Is a garage a living space?

For instance, someone who works in their garage often like for car repairs, or other reasons. If you are in your garage space often for any particular reason, it only makes sense that you would want the space to be comfortable. And in some cases, people are interested in turning their garage into a living space .

Do you need to insulate the entire garage?

You do not need to insulate the entire garage, you could actually do fine insulating just the internal wall of the garage. By installing insulation in the walls between the actual living space and the garage, you will experience more comfort within your home.

Does insulate your home lower your energy bill?

Properly insulating your home can seriously decrease your energy bill and make your space much more comfortable. During the winter and summer time, either the furnace or air conditioning is constantly running, which can easily cost hundreds of dollars.

Is it worth insulate a garage?

Is insulating a garage worth the investment? It isn’t the best bet for reducing the cost of your energy bill, but we don’t suggest throwing the idea completely out the window. You can make other changes to your garage that will be quite helpful, such as putting up a storm door on the garage door that goes into the house. You can also block or weather strip the garage doors and windows. Don’t close off your garage so much that exhaust fumes can’t escape, however.

What is the best insulation for a garage?

There are many different options and each one has different perks. The best insulation option for a garage is foam boards. Foam boards are relatively affordable and fairly simple to use. They are made from polystyrene and come in stiff boards. They are lightweight and durable.

How much does it cost to insulate a garage?

It also depends on how much insulation you use for your garage. A rough estimate for garage installation is $0.50 to $1.25 per square foot.

What happens if you don't insulate your garage door?

If you do not insulate your garage door, you are wasting your time with everything else. You also must fill in all the cracks and openings everywhere within your garage. While they may seem small, they let a lot of cold and hot air in and out.

Why is it important to have an uninsulated garage?

Many of us use our garage as extra storage and while an uninsulated garage provides protection from the elements, usually, it does not provide protection from extreme temperatures. Insulation can protect your items from humidity and rust, which can destroy them. Insulation can protect those in your house from carbon monoxide poisoning. Many people start their cars in the garage, which creates this deadly gas and without proper insulation, it can seep into your home.

What is the R value of a garage?

The R-value is the number that indicates the amount of resistance the insulation provides against outside temperatures. Since garages have a lot of air gaps, you need to fill those or no amount of insulation is going to help control the temperature in the garage. You can fill the cracks with low expanding spray foam.

Why is insulation important?

It can protect your house against extreme cold and hot temperatures. It can also help to decrease the amount of noise you hear. A home that is insulated well also tends to be more energy-efficient.

How tall is a commercial garage door?

The obvious difference between a commercial garage door and a residential garage door is the size. The standard height for a residential garage door is seven feet while a commercial garage door is usually taller and measures up to twenty-four feet depending on its application.

How does insulation help a garage?

How? Insulating the garage roof will prevent heat from transferring from the roof into the garage during the summer and prevent warm air in your garage from being transferred outside through the roof, keeping your garage at a stable temperature. In essence, insulation materials serve as a barrier that doesn’t permit heat to move through them.

Why is fiberglass insulation used in garages?

They are also the recommended material for insulating the entire garage as well. It slows down heat transfer drastically because glass is a bad conductor of heat.

What is the best insulation for a roof?

Spray Foam Insulation. Spray foam is one of the best options for insulating a roof. It is made of polyurethane, a popularly known insulation material even used on some garage doors. Just as the name depicts, spray foam insulation is sprayed directly under the roof.

What happens if your garage is uninsulated?

If your garage is uninsulated, all that air produced by the HVAC system will escape through the roof, walls, or doors. This will keep the HVAC system working continuously in an attempt to achieve the temperature you require. But that’s never going to happen, and this will drastically increase your heating and cooling costs.

How thick is a roof rafter insulation board?

These are insulation boards that come in predefined sizes. The dimensions are 4′ x 8,’ and the thickness varies between ½” and 4″. To properly make it fit between your roof rafters, you may have to cut them in the right sizes.

Why is my garage hot?

Because heat always transfers from a higher temperature region to a lower temperature region, all that heat on the roof gets transferred into the garage, or the attic, if you have a ceiling installed. This can make your garage extremely hot, and you wouldn’t want to waste a second there. In the winter or a cold climate, the situation is different. ...

Why do garages have no windows?

As you already know, the garage was made to store our vehicles. It is not designed as a room to dwell in. This is why most garages have no windows or vents. I explained this concept of garage ventilation in this article. I recommend you check it out.

Why insulate a garage?

So, when you insulate your garage, you make it more difficult for insects to enter. That helps cut down on bugs that can get into your home. Which is super amazing because who wants to have to call the exterminator?

What is the best insulation for a garage?

Rigid foam can be a great option for garage insulation. It installs clean with less air gaps, and you can get thinner versions if your walls aren’t very thick.

How much does it cost to insulate a garage?

Insulation prices and installation costs vary, but according to, the average cost is between $1.48-$1.95 per square foot to insulate your garage.

Why is insulation important?

As we mentioned above, insulation helps maintain a more regular temperature inside. That’s its purpose. To keep outside temperatures outside and help you keep your home more comfortable inside.

What is the most complicated part of insulation?

One of the most complicated parts of insulation in your garage is the garage door. I mean, look at it, it’s enormous. And everytime you open it, you let your climate-controlled air out and the outside air in. That is one giant air leak.

How many garage fires are there in the US every year?

According to the US Fire Administration, there are an average of 6,600 garage fires every year. Whether they are caused by faulty wiring or oily rags, garage fires are dangerous. Garage fires often take longer to detect, so they tend to be larger, spread further, and cause more damage than other house fires.

Does insulation work in a garage?

Insulation works the same way for cooling your garage as well. However, if you live in a hot, humid climate, you might find that there are some problems. We’ll discuss those later when we handle the downsides of garage insulation.

Why do we need to insulate a garage?

Insulation helps prevent the flow of heat into and out of the space, keeping it cool in the summer and warm in the winter. It also can lessen exterior noise, like traffic or loud neighbors. Insulating an unfinished garage can be a relatively simple task for experienced DIYers.

How many people do you need to insulate a ceiling?

The ceiling can typically be insulated in essentially the same way as the walls, though you will likely require at least two people, with one up on a ladder and the other nearby to hold insulation, pass tools, and support the ladder.

What do you need to remove a garage wall?

Nails, screws, and hooks are commonly installed on the wood studs of a garage so that lawn tools, ladders, and other objects can be mounted on the walls when they aren’t being used. A hammer, screwdriver, or pry bar is typically all that you need to remove any hooks, nails, screws, or any other fasteners or objects that may be mounted to the walls of the garage in order to get access to the bare studs of the structure.

Why do you put a vapor barrier on the warm side of the insulation?

Applying a vapor barrier on the warm side of the insulation helps to protect the insulation, the studs, and the exterior wall from issues that can be caused by excess moisture like rot and mold growth.

How to tell if a garage has cracks?

Inspect the outside of the garage and the inside of the garage to detect any cracks or gaps along the exterior walls. It’s also a good idea to determine if there are any cracks or gaps in the wall that’s shared with the home.

What is the purpose of a garage?

Protect the garage from extreme heat and cold with insulation, so you can enjoy a more comfortable space all year long. The garage is often used for more than just storing the car, seasonal items, tools, and lawn mower. Many people take advantage of the extra space to create a functional workshop, mudroom, entertainment area, or another kind of use.

Can you use fiberglass batts for insulation?

Fiberglass batts and rigid panel insulation are the most commonly used options due to their versatility and affordable price. Fit the insulation into the gaps between the wall studs and use a sharp utility knife to cut the insulation to the correct size instead of forcing the insulation to fit the space.

Why is it important to insulate a garage?

Insulating a garage will be of limited value if door gaskets, window weatherstripping, and other air gaps are still providing places for air to flow. Always seal these areas when you are addressing the energy efficiency of a garage.

Why put insulation in the ceiling of a garage?

Put insulation into the ceiling of the garage so it helps stop the loss of energy to the space above, where it may connect to the house attic or a room above the garage.

What is foam board insulation?

Foam board insulation: thin, rigid, high-insulating value panels. Spray foam insulation: sprayed onto your garage door, but not the most effective method; the same kind of insulation sometimes sprayed against roof sheathing from the inside to improve the R-value in an attic.

How often does a garage door open?

In most homes, the garage door opens several times a day , exposing most of an entire wall to outdoor air. Because a garage door functions like this, it's tough to adequately seal and insulate the garage.

How much does a double garage door cost?

But remember that an energy-efficient double garage door costs somewhere between $1,500 and $2,000, so it will take considerable time to pay back the cost of the door in terms of energy savings. And it really only makes sense for spaces where the garage door won't be opened routinely to break the energy envelope.

Which insulation is the least expensive?

Fiberglass insulation batts: least expensive insulation; best applied on the inside face of the door

Is there insulation in a garage door?

Garage door insulation is of limited value anyway, given the other areas of the garage that are equally problematic in terms of energy loss. The floor of your garage is probably built on a slab, which means that it isn't insulated and is an ongoing source of energy transference. If your garage has concrete walls, these, too, are constant sources of transference. If you take the time and spend the money to insulate the entire garage, you may well be disappointed by seeing a very minimal improvement on your energy bills.


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