How To Insulate Garage Ceiling Rafters

In the case of a cold roof structure the insulation is placed between or between and under the rafters or at ceiling joist level and the roof is ventilated by leaving a 50mm gap above the insulation which vents air to the outside.

How to insulate garage ceiling rafters.

If the garage is open to the rafters the boards that support the roof use r 38 insulation between the rafters at the roof if they are 10 inches deep. Push the insulation in place between the rafters but be careful not to compress the material. Measure the space between joists and studs to determine the width of the insulation you need. To prepare determine the area of the space you plan to insulate and add 10 to 20 percent to account for mistakes and odd spaces you need to fill.

The insulation should be installed with the paper facing out and attached using staples. 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. The paper will fold over the rafter framing thereby allowing for attachment with staples. Safety precautions and mistakes to avoid during garage roof insulation.

To get more insulation in the garage install a ceiling and provide access to the space between the ceiling and the roof. For insulation to reach its full potential for preventing warm air migration it must maintain the. 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. This will allow you to add the needed insulation.