How to Insulate a Garage

Written by ehow home & garden editor
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Many people want to convert their garages into workshops or an extra living space. However, unlike houses, garages are rarely insulated. Follow these steps to prepare your garage for year-round use in any climate.

Skill level:
Challenging

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Things you need

  • Fiberglass insulation batting
  • Staple gun
  • Utility knife
  • Straightedge
  • Plastic sheeting
  • Power drill
  • Insulation blower
  • Blown insulation
  • Tube of window caulk
  • Caulk gun

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Instructions

    Insulate Exposed Walls

  1. 1

    Place insulation in between 2" x 4" wall studs. The insulation should be attached to the 2" x 4" studs with the insulation facing away and the paper side visible.

  2. 2

    Staple paper edges to the 2" x 4" studs every 12 inches.

  3. 3

    Cut insulation to fit, using a sharp utility knife and a straightedge. Make sure there are no gaps in the insulation.

  4. 4

    Repeat for each gap.

  5. 5

    Pull vapor seal plastic film tight and staple at least every 12 inches. Start at the top of one corner of the garage.

  6. 6

    Overlap the sheets by one complete cavity, working around the entire room.

  7. 7

    Trim out the plastic from over windows, doors and electrical boxes using utility knife.

  8. 8

    Staple around the windows, doors and electrical boxes to ensure a tight vapor seal.

    Insulate Walls That Have Been Drywalled

  1. 1

    Drill a small hole in the drywall between the studs at the top of the wall.

  2. 2

    Blow insulation into gap, using slow-curing foam or fiberglass insulation. There are many makes and models of insulation blowers. Follow the manufacturer's directions at all times.

  3. 3

    Repeat for each gap, moving around the room.

    Seal Windows and Doors

  1. 1

    Insert caulk tube into caulk gun.

  2. 2

    Snip off tip of caulk tube with a utility knife.

  3. 3

    Gently squeeze caulk gun handle as you move along the seam of each area. Apply caulk around all window and door frames.

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