Insulating Your Garage Insulating Your Garage


Ever think about the fact that an uninsulated garage besides being cold in winter and very hot in summer is right beside your living area? All that heat or cold is naturally going to affect the  living conditions inside your home. By simply adding insulation to your garage you can help moderate the swings in temperature inside your garage and keep make your home more comfortable. Insulating your garage is a relatively inexpensive project ,doesn’t require any special tools and can be done in a weekend.

Insulating garage wall

Insulating unfinished garage walls

  • The easiest way to insulate an unfinished garage wall is to install fiberglass bats between the exposed studs.
  • Fiberglass bats are available in 13” and 21” widths specifically designed to fit snugly in between studs installed either 16” or 24” on center.
  • If you use “faced” bats (paper covered) install the insulation with the facing pointed in towards the garage and staple through the edge of the facing into the studs to hold the insulation in place.
  • If you use unfaced fiberglass bats, friction between the fiberglass and the wall studs will hold it in place. Cover unfaced insulation with a solid sheet of 6 mil plastic stapled into the studs.
  • The paper “facing” or the plastic sheet will act as a vapor barrier to prevent any movement of moisture through the insulation.
  • In some areas fire regulations require the insulation be covered with drywall..

Insulating covered walls

  • If the studs in your garage are covered, you have the option of removing the covering and installing fiberglass bats the same way you would insulate unfinished walls, or you can add insulation using blown cellulose or spray foam insulation installed through holes cut into the wall coverings inside the garage.
  • Blown cellulose should settle around any obstacles behind the wall covering and slow curing foam insulation will flow over any obstructions behind the wall.


Insulating a Garage Door

Things you will need

  • Construction adhesive
  • Sheet of 4’ by 8’ 1” thick closed cell poly insulation
  • Sheets of ½” thick foil backed poly insulation (designed to reflect heat)
  • Utility knife or fine toothed hand saw


Insulating Your Garage Doors

  • First attach strips of the 1” poly insulation to the middle and both ends of each door panel with construction adhesive. Make the strips 2” wide and 1” shorter than the height of the panels, and attach them to the door. These strips have a dual purpose. First they give you a surface to attach the foil backed poly to the door, but more important,they keep the insulation away from the door, creating an insulating air gap.
  • Finish by cutting the ½” foil backed insulation to match the size of each door panel and attach these directly to the insulation strips already on the door..Position these pieces with the foil backing facing towards the door panel, so both heat and cold are reflected towards the outside of the garage.

Murray Anderson is a veteran freelance writer with over 800 articles published in newspapers, in print and on the web. He can be reached at [email protected]

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