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Floors Over Unheated Areas

Floors above unheated areas such as crawlspaces, porches, cottages, carports or overhangs should be insulated to keep the floor comfortable.

  • Install approved vapor barrier/retarder on warm side of insulation to fit floor continuously. (if required by local building code)

1. Install ComfortBatt™ between floor joists.

  • Where foundation wall is open, insulation should fit firmly against the header and overlap sill plate.

2. Install ComfortBatt™ insulation to fit snugly between floor and underside of floor joists. Hold batts in place using any of:

  • Wire mesh
  • Strapping
  • Criss-crossed wire or string
  • Weather grade sheeting
  • Air barrier sheet membrane
  • Do not apply vapor barrier/retarder on underside of insulation as it has the potential to trap moisture.