How do I improve existing vaulted ceiling heat loss?

Written by todd bowerman
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How do I improve existing vaulted ceiling heat loss?
Vaulted ceilings can be challenging to insulate. (ceiling fan image by Adrian Hillman from

Cathedral, or vaulted, ceilings are an attractive way to open up a room, but they are also notoriously high on heat loss. Keeping a room with a vaulted ceiling warm in the cold winter months can prove to be a costly expenditure, but luckily there are number of ways to improve your current vaulted ceiling's heat retention.

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  1. 1

    Install foil-faced batt insulation into the area in between your vaulted ceiling and the roof deck. If your ceiling was constructed leaving room for insulation of this nature, batt insulation is a good option, because its 0.5 perm rating (the amount of heat that escapes) is great for ceilings without an attic.

  2. 2

    Have a professional inject the area between your vaulted ceiling and roof with foam insulation. If you're short on space in between the ceiling and roof deck, this may be a better option than traditional insulation.

  3. 3

    Install rigid foam board insulation to the underside of your rafters. This is a good option for vaulted ceilings with very little space between the roof and ceiling. It is important to note that exposed foam insulation must be covered with a fire-rated material like drywall to comply with safety codes.

  4. 4

    Attach furring strips to the bottom side of the rafters and use them to install additional insulation, such as high-density batts. With furring strips, you can add very thick, protective insulation to a vaulted ceiling with very little roof deck clearance.

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