How To Insulate Garage Ceiling Rafters
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Measure the space between joists and studs to determine the width of the insulation you need.
How to insulate garage ceiling rafters. For insulation to reach its full potential for preventing warm air migration it must maintain the. Be sure to count the spaces above doors and windows. 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 fiberglass insulation comes in rolls that are 16 to 24 inches wide.
The paper will fold over the rafter framing thereby allowing for attachment with 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. 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 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.
The insulation should be installed with the paper facing out and attached using staples. The rolls have a number of 8 foot pieces rolled onto one roll. Push the insulation in place between the rafters but be careful not to compress the material. This will allow you to add the needed insulation.