How To Add Insulation to Garage Walls

Walls with insulation

Because a garage is not normally heated in the winter or cooled in the summer, many people leave their garages uninsulated. Whether a garage is attached to the home or not, insulation is often added to make the building more comfortable throughout the year, especially for large garages with workshops or commercial garages.

Step One:

Research and decide on the type of insulation you wish to add to the garage. The current state of the garage walls will be a type determinant, as exposed interior walls have different insulation options than covered interior walls. For walls covered in sheet rock, small holes can be drilled at the tops to install spray and loose fill types of insulation. Exposed wall studs can be filled with foam board insulation or blanket insulation, also known as roll insulation.

Step Two:

For spray and loose fill insulation types, drill small holes in the top of the wall, in between each wall stud.

Step Three:

Use a stud finder to determine the location of each wall stud.

Step Four:

After the insulation has been installed, the holes can be filled with putty and the walls repainted.

Step Five:

Measure the height of the wall for foam board and blanket or roll insulation. Cut the insulation pieces to fit in between the studs of the wall. The insulation should be bought in the necessary width to fit snuggly between the wall studs. So use the measurement between the studs to purchase appropriate blanket, roll or foam board insulation.

Step Six:

Cut the insulation to fit the height of the walls and push into places between the studs of the garage walls. The insulation boards or unrolled sheets will fit snuggly between the studs, requiring minimal pressure to install. A utility knife works best to cut the insulation to appropriate lengths; handsaws and industrial scissors may also be used.

Step Seven:

Stand on a stepladder to install each piece of insulation from the ceiling to the floor in between the wall studs.

Step Eight:

Secure the insulation into place by stapling along the edges of the insulation, at an angle, into the wall studs.

Step Nine:

Cover the insulation with Sheetrock or plywood pieces. The insulation can be left exposed because insulation boards or rolls are backed with cardboard or paper that prevents the insulation from spreading through the room once installed to the garage walls.

Use safety precautions while adding insulation to garage walls. Wear safety goggles, respiratory masks, long sleeve shirts, pants, full-cover footwear and work gloves while cutting and installing the different types of insulation, especially when fiberglass is included in the material which makes up the insulation. These safety items prevent particles of insulation from irritating and cutting the skin, eyes and airways.


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