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How to Choose and Use Foam Insulation

This Old House general contractor Tom Silva explains the wide world of spray-foam insulation.

In this video, This Old House general contractor Tom Silva explains the wide world of spray-foam insulation.

Tips for Selecting and Using Foam Insulation

  • Pick the appropriate foam insulation for the job at hand. Shake can well before applying.
  • Use minimal-expanding Window-and-Door Foam to insulate around windows and doors.
  • Apply the foam sparingly, allowing it to expand to fill the gaps.
  • Use Gap-and-Crack Foam to fill spaces between the house foundation and mudsill.
  • Spray foam insulation behind electrical boxes prior to insulating the walls with fiberglass batts.
  • Use fire-block foam insulation to fill holes around pipes, electrical cables, and ducts.
  • To insulate large areas, such as stud bays, use two-part polyurethane spray foam.