How to Install Insulation in Eaves


One area of the home that is often insufficiently insulated is the attic eaves, which results in a significant amount of energy loss. Before spending another season paying more than necessary in heating or cooling bills, consider insulating your eaves yourself. The most important part of eave insulation is ensuring that your soffit vents, which are located on the underside of the eaves, will be clear and able to provide ventilation to your attic. Approximately 1 inch of space is required between the insulation and the ceiling at the eaves to allow for proper air flow.

Things You'll Need

  • Plywood
  • Rafter vents
  • Staple gun and staples
  • Insulation
  • Foam board (if using blown insulation)
  • Put down a large sheet of plywood over the floor joists in your attic to give yourself a place to stand while you work.

  • Place a rafter vent against the ceiling, between the rafters at the point where the ceiling meets the floor of the attic. The rafter vent will prevent the insulation from blocking air flow from the soffit vents; it should be positioned so that the two side edges are flat against the ceiling, leaving a small gap between the ceiling and the middle portion of the vent. Use a staple gun to secure the edges of the vent to the roof decking.

  • Install additional rafter vents between each rafter in the area of the attic where you are planning to insulate.

  • Add insulation between the floor joists in the attic, making sure it goes all the way over to the eaves. If you are using insulation blankets or batts, simply roll the insulation out until it rests securely against the rafter vents. If you use blown insulation, place a piece of foam board in front of each rafter vent before blowing the insulation into the eaves. This will prevent any insulation from going into the vents and blocking them.

Tips & Warnings

  • Before purchasing rafter vents, measure the space between your rafters. Rafter vents come in 14 1/2- and 22 1/2-inch widths.
  • If you are placing new insulation over older insulation, put down the new insulation at a right angle over the old.
  • Wear work gloves, safety glasses and a breathing mask when working with insulation.

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