Insulating Attic Over Unheated Garage

The garage door typically has gaps and small cracks where air can get through easily.

Insulating attic over unheated garage.

Insulating an attached garage may. Summer turns them into sweltering ovens. In the winter they are cold uninviting places. In unfinished attic spaces insulate between and over the floor joists to seal off living spaces below.

Insulating the attic above the garage will help keep temperatures in the garage a bit more stable but it won t have any appreciable effect on energy bills. On a cool day that might be fine but during the middle of the summer in arizona where temperatures are near 120 degrees or above those small cracks can turn into jet streams of hot. Adding insulation to a garage will help moderate temperature extremes particularly if the garage space is attached to a house. Garages are typically unheated and uninsulated.

Insulating the area in the attic over a garage might keep the temperature a little more stable in the garage but it does little to reduce the amount of energy needed to heat and cool your house so it s not a good investment of your energy dollars. When you should insulate the garage if your home s hvac system does extend into the garage then the attic above it should be insulated as it would for any other room of the house. If the air distribution is in the attic space then consider insulating the rafters to move the distribution into the conditioned space. Danny lipford in an uninsulated attic over a garage.