How to Install Styrofoam Insulation

All homes and businesses need to be insulated. This is necessary not just to keep buildings warm in winter, but also to keep out the heat of the warmer months. One of the most popular and practical forms of insulation is foam board, or Styrofoam. Foam board needs to be installed before the wallboard has been hung as it goes between the 2-by-4 framing. With the right tools and a little know-how this is a job most do-it-yourselfers can handle.

A utility knife is the central tool for foam board installation.
  1. Measure for the proper cut. Determine the height and width of the space between each stud. Be sure to use a metal measuring tape because it will not stretch and therefore gives you the most accurate measurement.

  2. Cut the Styrofoam board. Score the board with a sharp utility knife. Always cut away from yourself. Once it is scored, bend the board until it breaks along the line.

  3. Attach the insulation to the framing. If the cuts were made accurately the foam board should fit between the studs snugly. Use a small amount of construction adhesive if needed, but do not nail, staple or screw the insulation in. This will create gaps, lessening the overall effectiveness.

  4. Cover the Styrofoam board insulation with a vapor barrier. Cut and staple sheets of heavy plastic to the studs, covering the foam board. Foam will collect moisture and installing a vapor barrier will protect the walls.

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