While you've probably made sure most areas of your home are well insulated against summer's heat and winter's cold, you might have overlooked the attached garage. A poorly insulated garage can spill the outdoor weather directly into your climate-controlled home. Each little spill can cost valuable dollars on your energy bill. However, with a little foam board insulation and a bit of your time, you can stop the money leak and make the garage a more comfortable temperature year-round, too.
Measure the length and width of each of the sections of your garage door, excluding the metal framing around the door. Cut a piece of foam insulation with a utility knife according to your measurements for each section of the door.
Spread construction adhesive all over one side and the edges of one piece of foam board, applying it in a zigzag pattern. Spreading it on the edges helps to ensure the foam adheres securely to the garage door.
Align the foam board within one section of the garage door and press down firmly to ensure the adhesive on the foam makes sufficient contact with the garage door. You can bend the foam a little if necessary to fit it within the section’s frame and to ensure it presses against the door adequately.
Seal around the outer edge of the section with aluminum foil tape to provide optimal thermal insulation and help to keep the board in place while the adhesive dries. Repeat steps 2 through 4 to install a piece of foam board insulation onto each section of the garage door.
Lean 2-by-4s or other heavy pieces of wood against the garage door to keep the foam board in place and to maintain adequate bonding between the foam board and the door while the adhesive dries. Allow the adhesive to dry for the time specified in the manufacturer’s instructions before removing the wood or using the garage door.