Garages typically aren't built to be airtight and have lots of air gaps to the outdoors. It's also important to realize the value of air sealing in conjunction with insulation. The walls that are shared with the house, however, should always be insulated to their maximum value. It's also unlikely that this minimum improvement in energy transfer will offset the costs of adding extensive insulation. But no state requires the entirety of the garage to be insulated as part of an energy-efficiency mandate. Some say that insulating an unheated garage that is attached to the house may offer an additional thermal buffer between the exterior of the home and the outdoors. In reality, insulation merely slows the transfer of heat through the insulated barrier (wall, ceiling, or floor), which is good for hot and cold climates. It's a popular misconception that insulation adds warmth. If you're not adding heat, there's little point in insulating. It pays to insulate your garage if you're adding a garage heater, whether on a permanent or as-needed basis. You may also want to look at insulating the garage door, which has different installation requirements than walls or ceilings. Some types of insulation are better than others for a garage, depending on whether the space is finished or not. ![]() It makes sense to insulate your garage, especially if you're planning to heat the space. Insulation for your garage is typically the same insulation you use inside your home to plug up air holes and reduce the amount of colder air coming into the space and the warmer air leaving the space. ![]() The Spruce Home Improvement Review Board.
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