TheDrive and its partners may earn a commission if you purchase a product through one of our links. Read more. Your garage can serve many purposes other than just a parking spot. The space is perfect for storage and even as your own personal workshop. But garage doors are notoriously drafty, which can make spending time inside them a lot harder. Fortunately, you can fix this problem by adding insulation to your garage door. These kits are the best choices to get the job done. Radiant barriers are highly reflective materials (generally made of aluminum) that are used to block the radiant heat energy instead of absorbing it like fiberglass insulation. When it comes to insulating your garage door, reflective garage door insulation will typically feature one or two layers of reflective barrier and an “air space” layer, sometimes made of bubble wrap. One of the most common types of insulation is foam. There is spray foam, which you simply spray onto your garage door and allow it to dry. Spray foam insulation isn’t the best option for garage doors, but it is the easiest to use and it is also the cheapest option. Rigid foam, or foam core, is an insulation made from s...