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How to Insulate a Garage Door

4 Feb 2019

Looking for ways to reduce your energy bill? Your garage door may be a good place to start.

If you have a garage that is attached to your home, insulating it can save you money -- especially in the winter when the bill tends to skyrocket.

A drafty, poorly insulated garage door will allow cold air to blow in, making the interior cool. If your garage is attached to your home, that cold air will affect the air temperature inside your home too.

Is Insulating My Garage Door Worth it?

There are many reasons why insulating your garage door is a good idea and worth the investment. Depending on what you use the garage for, and whether or not it is attached to your home, may affect your decision.

If you use your garage as a living space that you want to be able to access year round, insulating the door is a good idea.

If the garage is used only for parking your cars, you may want to skip the door insulation and focus on insulating the ceiling and shared walls with your home to reduce cold air from getting inside.

On average, adding insulation to your garage door will keep the temperature of your garage around ten degrees warmer during the winter and twenty degrees cooler in the summer. This is especially useful when your garage is used for a workspace, living space, or workout room.

Insulation will also provide a barrier to reduce noise if you are using loud power tools or other equipment that can be disturbing to neighbors.

How to Insulate a Garage Door

Specialized garage door insulation kits are available from most home retailers, in-store or online. These kits should contain just about everything you need to get the job done, including vinyl or foil-faced batts or rigid foam boards that attach to the back of your garage door. These kits also include specialized pins to anchor the foam boards or batts to the inside of the garage door.

One of these kits will run you anywhere from $50-$100 depending on the brand and the included materials. Purchasing a specialized package is not necessary, but they can save you time as they contain everything you need to insulate the door securely.

Custom-Made Foam Boards

Another option is to purchase the foam panels and custom cut and size them to your door’s dimensions using a utility knife. You will want to choose foam panels that are foil-faced and flame resistant.

You can secure the foam boards by using foam-safe adhesive and expanding foam to seal around any gaps. Be sure to check the label of any adhesive or foam before you purchase it to make sure that it is compatible with the foam that you are using. Some adhesives and foams will melt away from the boarding.

Batt Insulation

Another option for DIY garage door insulation is to utilize batt insulation. Batt insulation is usually cheaper than foam boards or kits and is readily available in rolls.

You do not want to use thick batting to insulate your garage door, but rather the thinner, foil backed batting typically used for HVAC ducts and plumbing. This can be purchased from plumbing retailers or online.

Securing the batts to your door will require an adhesive that is compatible with the particular batting that you choose.

Additional Measures

While following the tips above for insulating your garage door will help you retain heat inside your garage and keep cold weather out, there are a couple of additional things that you can do to ensure proper insulation:

  • Make sure that the rubber sweep at the bottom of your door is in working order. This should be replaced every few years as wear and tear are normal.

  • Install weather stripping around the outsides of your entryway to seal up any cracks or gaps that may exist.

Keep in mind that for best insulation and protection from cold drafts, you may want to consider insulating your entire garage. Insulating the garage door is a great first step that is well worth the time and investment, but insulating the entire garage will provide the best protection from cold weather drafts.

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