But when garages attached themselves to houses, and people began spending more time in the garage itself, it became necessary to provide garage insulation. Learn the basic concepts behind garage insulation and what you should do (or not do):
- Garage Door Insulation is a Priority
Newer, better garage doors are insulated; most are not. One way to fix this is to insulate the garage door, using a kit. Basically what you get are rolls of reflective insulation designed to fit between the garage door's support rails. I've looked at these kits and see nothing amazing about them; you can do the same thing by buying your own reflective insulation.
In any case, here is a kit: Buy Direct - Single-Sided Door Insulation
- Seal Bottom of Garage Door
Wind positively whistles through the bottoms of most garage doors. This is because the seal at the bottom is inadequate. Also, garage and driveway slabs can tilt over time, creating gaps that the garage door bottom cannot cover. Use a garage door threshold kit to solve the problem. It's inexpensive and goes down quickly.
- Provide Better-Insulated Door to the House
If the above don't do the trick, then look at your door to the garage. Is it an exterior, fire-rated door (we hope)? If not, some previous homeowner may have put a highly non-insulated hollow core door there. Solid wood doors are better but not by much.
- Insulate Wall Between Garage and House
Now we're getting into the more work- and money-intensive projects. Is the wall between the house and garage insulated?
Go out in the garage, put a 1/8" auger bit on your cordless drill, and drive a hole into the wall at an out-of-the-way spot one or two feet off the ground. Don't drive into a stud. And be sure to flip off any circuit breaker that might even remotely have wires running through that wall. Because this is a key location (service panels are often located in garages), you may want to raise the garage door for light and turn off every circuit breaker.
If you have batt insulation, it will come up on your auger almost like cotton candy. If not, you may want to cut a larger hole so that you can look in there with a flashlight and see if you have blown-in insulation.
You can insulate the wall with blown-in insulation, or if you really want to go crazy, you can pull off drywall and insulate with batt fiberglass. Or, build a second wall just for the purpose of holding the batts.