How to Insulate a Vaulted-Wall Attic

An attic with vaulted walls is one in which the rafters are visible. Typically the rafters rise up into the apex of the roof. This type of attic is sometimes referred to as a cathedral or sloped attic. Effective insulation in the attic helps to preserve interior heat and prevent too much heat from the sun entering the home. It can, therefore, result in lower energy bills. The rafters in the vaulted walls of an attic provide a means by which insulation can be installed.

Tar-paper baffles
Gloves and face mask
Utility knife
Foil-faced fiberglass batts
Staples

Instructions

- 1
  Check the Department of Energy Insulation Fact Sheet website (see Resources) to determine the R-value of the insulation you need for your home to be efficient at preserving heat. The R-value is the unit that measures a material’s thermal conductivity.
- 2
  Wear gloves and a face mask. Fiberglass fibers can irritate if inhaled, and the bonding chemicals can cause the skin to itch.
- 3
  Staple tar-paper baffles between the rafters to provide a buffer between the outer wall of the attic and the insulation. An attic must have ventilation to allow air to flow through it and prevent condensation forming, which can result in mold and mildew.
- 4
  Use the utility knife to cut the fiberglass batts to the correct length and width to fit tightly between the rafters.
- 5
  Staple the batts to the rafters over the tar-paper baffles. The foil facing should be turned toward the interior.

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