All homeowners have an inherent reason to want to keep their garage insulated, as most garages in modern homes are connected to the rest of the house. When a garage gets incredibly hot or cold, then it has a profound impact on the temperature inside of the house, causing your heating and cooling system to work harder than it needs to. For this reason, it’s important to make sure that your garage door is properly insulated, as this is one of the most liable points for the outer elements to affect your garage’s temperature. Here is some information about garage door insulation…


Insulation materials are measured in R-value, which measures the thermal resistance of a material. A material with a high R-Value will have a stronger thermal resistance, which means that heat will have a hard time working through it. Ideally, materials used for insulation have a high R-value, then.

Insulation materials

Garage door insulation can be accomplished with a variety of different materials. Aside from the inherent R-value of the garage door’s outer material, many modern garage doors will have a hollow section that is filled with more insulative material. Here are some common materials used for garage door insulation:

  • Polystyrene Foam
  • Fiberglass
  • Polyurethane Foam
  • Foil Insulant

Garage door seals

Even if your garage door has a high R-value, there is a strong possibility that there will be gaps that make it easy for heat to enter or escape your garage (depending on the season). For this reason, it’s important to seal the area around your garage door. This can be accomplished by applying weatherstrip around the garage door. In addition, you’ll want to add a weather barrier to the bottom of your garage door, and to the threshold between your garage and your driveway.

Why garage insulation matters

A properly insulated garage will help you save money in heating and air conditioning costs in your home, which also makes your home more environmentally friendly. In addition, this makes your garage more fun to work and hang out in. No one wants to be a garage that is super hot or cold. Properly insulating your garage door will make your garage a more functional amenity to your home.