Insulating Garage Roof

Opening vents in the soffit would allow air to flow from the low edge of the roof up along each channel between the rafters and up to your ridge vent.

Insulating garage roof. If you are insulating the garage ceiling not only by the truss level but also up by the roofline then you must leave at least 1 1 2 to two inches of air between the fiberglass and the underside. So before insulating go around the garage with a can of low expanding spray foam and seal all gaps and cracks that let in the daylight. If you have a flat garage roof and an attic above you can install the garage insulation from below using a standard ladder.

You can insulate the walls ceiling and door of the garage to the highest r value possible but if you fail to fill those air gaps you ll still be wasting a lot of heat. One of the best methods you can use if you want to regulate the temperature of your garage is to insulate the garage roof. I wrote a big article discussing whether you should insulate your garage.

Adding insulation won t make your garage a perfect temperature by itself but it will take the edge off the freezing winters and the sweltering summers. In either case you will need to follow the general steps below to insulate your garage roof. The regulating temperature has positive effects on your cooling and heating costs.

If your garage is attached to your house you will notice a big difference in your home s temperature as well. There should be a continuous ridge and soffit ventilation.