Get the original top-of the-line Matador Garage Door Insulation Kit.
(Formerly known as the Falcon Foam Kit).
You can get their kit for less than $100, and if you live in the hotter or colder parts of the country, and you like to use your garage for something more than storing cars, I think you’ll agree that that is a low price to pay for the energy savings and comfort.
Let’s see what’s in the box:
Each garage door insulation kit contains eight door insulation panels. The panels measure 54 inches long by 20 and 1/4 inches high by 1 1/4 inches thick. The panels are manufactured with EPS insulation, and the side of the panel the faces out where you can actually look at it is finished with high impact polystyrene laminate. This is going to give you a really clean, finished, professional look.
When they’ve also taken the trouble to score the panels so that you can easily bend them. This makes it easy to insert them into the gaps in your metal garage door. An added bonus of using polystyrene for the exposed face is that it can be cleaned with nothing more than a little dishwashing liquid and a rag. Also, even though the panels and are only 1 1/4 inches thick, they have an R value of 4.5 at 75°. Not bad at all.
They also have extra panels available if your garage doors are oversized like mine, or if you simply have a very large garage with two or more doors.