How To Insulate Garage Ceiling Rafters

Measure the space between joists and studs to determine the width of the insulation you need.

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. 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. 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 insulation should be installed with the paper facing out and attached using staples.

For insulation to reach its full potential for preventing warm air migration it must maintain the. The rolls have a number of 8 foot pieces rolled onto one roll. This will allow you to add the needed insulation. 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 fiberglass insulation comes in rolls that are 16 to 24 inches wide. To get more insulation in the garage install a ceiling and provide access to the space between the ceiling and the roof. Be sure to count the spaces above doors and windows. Safety precautions and mistakes to avoid during garage roof insulation.