As the weather cools, it’s the perfect time to guard your garage against the colder temperatures on the way, especially if you’ve got your home workshop in there. Metal garage doors block strong winds but do little to maintain a comfortable temperature.
But if you’re not ready to plunk down upwards of a thousand dollars for a new, pre-insulated model, consider gearing up the garage door you’ve got. We’ve assembled all the info you need to understand how to insulate a garage door successfully, plus tips to help you get the maximum benefit of the project.
Adding insulation to the door’s interior channels can help keep your garage an average of 10 to 12 degrees warmer in winter and as much as 20 degrees cooler in summer. Insulation also reduces noise transfer, so not only will you avoid hearing street traffic when in your workshop, but you’ll also spare your neighbors the sounds of your son’s rock band practice.
The simplest way to insulate a garage door is with a Garage Door Insulation Kit containing either vinyl- or foil-faced batts or foil-faced rigid foam boards. Kits start around $50, and as they increase in price, often offer a more complete set of supplies—adhesive, tape, a utility knife, gloves, and perhaps even a dust mask—than just the insulating materials.
However, the prime benefit of a kit is its specially designed retainer pins. Made of lightweight plastic or metal, the pins have plates attached that adhere to the back of the garage door channels to help anchor rigid foam or batts in place.
This stabilizes the insulation so it won’t fall on your car when the door is open. If you opt against a kit, you can use other methods to hold the insulation in place.
Skipping the kit? Most DIY-ers opt for foil-faced rigid foam board panels that you measure and cut with a sharp utility knife, or table saw to fit the channels inside your garage door.
While standard batt insulation is readily available—you might even have an extra roll laying around—and it’s often slightly cheaper than foam board, it’s probably not the best choice for garage door insulation if you’re not using a kit.
The thinnest standard batt, at 3-½ inches thick, is too thick for most garage door channels, and compressing the batts greatly reduces their ability to insulate a garage door. If you’re set on batt insulation, find thinner, 1-½-inch thick foil-faced batting—the kind used for wrapping HVAC ducts at plumbing supply stores or order it online (do-it-yourself centers don’t often carry it).
To hold the batts in place, you’ll also need to use the correct adhesive and tape recommended by the batting manufacturer.
To make the most of your garage door insulation project, replace the rubber sweep on the bottom of the door. Also, install weather stripping around the sides of the garage door to prevent icy drafts from blowing in.
And while insulating the doors is a great first step, you’ll enjoy more heat-retention if the rest of your garage is insulated as well—heat can still escape through a non-insulated roof or sidewalls.
But whatever steps you take before Old Man Winter comes calling will keep you toastier inside your workshop. But we warn you: You’ll have no excuses to not get things done in there!
From: Bob Villa
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