How to Install Garage Door Insulation

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Installing insulation in your garage door can seal it against the weather and help cut your energy bill.
The garage in your home is where you usually park your car, store your tools, and keep your lawn care equipment. Often, though, this room is left uninsulated, especially around the garage door.
Insulating oyur garage door is especially important if you have vents that blow heated or cooled air into your garage. Before starting, though, you need to determine the type of insulation you want to use and how much you need.
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Choose the insulation for your garage door

Before installing insulation in your garage door, you need to determine what type of insulation you want to use and how much you need.
Here are the different types of insulation available.
  • Batt insulation: Made of fiberglass, this type of insulation is flexible and allows you to easily shape it to fit the panel. Batt insulation also has a paper or foil backing that helps keep out water vapor and cold air. This insulation type is also the most cost effective at about 30 cents per square foot.
  • Foam board insulation: Foam board insulation is comprised of rigid panels composed of polystyrene. Its high insulation value with just a little bit of thickness represents one of the best things about foam board insulation.
  • Reflective insulation: With the ability to reflect radiant heat, reflective insulation has aluminum on one or both sides. Great for garages that get hot during the summer, this insulation is the most expensive at roughly $2.30 per square foot.

How much insulation do you need?

To determine how much insulation you need for your garage door, measure the distance between the inside flange of each door panel from the garage side of the door.
This includes measuring the height and width of the panel and multiplying both measurements to come up with the square footage needed. Add up the measurements for each panel to get the amount of insulation you need.

Install the insulation in your garage door

Materials needed
  • Aluminum foil tape
  • Cut insulation
  • Double-sided tape
  • Flathead screwdriver
  • Measuring tape
  • New bottom seal
  • Pencil or pen
  • Pliers
  • Straightedge
  • Utility knife
Once you have the insulation, you need to install it. When cutting the insulation for the door panels, make sure that you have enough room to work in. The section below walks you through the insulation-installation process.
Step 1: Measure the insulation. Measure and mark the insulation according to your measurements from earlier.
Measure a little large, as you can always trim down the insulation if it is too big.
Step 2: Place the insulation. Once you have all of the insulation pieces ready to go, place them into the appropriate panel.
Either tuck the insulation into the door's frame, if it has one, or align each individual piece directly within the recessed panel and attach it to the door
In addition, trim any excess insulation at this time if it is too large.
Step 3: Attach insulation to the door. Using aluminum foil tape, attach each section to its corresponding door panel.
If you have double-sided tape, affix the insulation to each panel by first placing long strips of the tape on the surface of the door before placing the insulation.
Step 4: Test the garage door. Test the garage door to make sure everything works properly.
Adjust the insulation if necessary.

Replace the garage door's bottom seal

In addition, you might want to replace the bottom seal of the garage door, as over time this seal can degrade and fail, letting hot or cold air into the garage. The following steps detail the bottom seal removal and installation process.
To replace the bottom seal, use a flathead screwdriver to uncrimp the aluminum track that runs along the bottom of the door.
Step 1: Uncrimp the aluminum track. To replace the bottom seal, use a flathead screwdriver to uncrimp the aluminum track that runs along the bottom of the door.
Twist the screwdriver gently to bend the aluminum track into a position to allow the removal of the bottom seal.
Repeat this on each end of the track.
Step 2: Remove the old bottom seal. Slide the old bottom seal out of the aluminum track.
Step 3: Install the new bottom seal. Next, insert the new bottom seal, sliding it into place.
Step 4: Re-crimp the aluminum track. Using a pair of pliers, recrimp the aluminum track along the bottom of the garage door to hold the new bottom seal in place.
Properly installing insulation on your garage door, as well as the rest of your house, can help cut your energy bill.
When installing insulation, it is important to measure the door panels to make sure that you get enough insulation. You should also cut each piece a little large when first cutting insulation pieces for each door panel to make sure that you have enough material to cover the panel sufficiently.
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