A vapor retarder is any material that limits the transmission of water vapor. If you're using unfaced fiber glass insulation a suitable vapor retarder is a 4- to 6-mil polyethylene film.

Or, you can buy faced fiber glass insulation, which has the vapor retarder already attached. Types of faced insulation include:

• Kraft-Faced -- kraft paper coated with an asphalt adhesive.

• Foil-Faced -- foil-backed paper coated with asphalt adhesive.

• Flame-Resistant Foil-Faced -- foil-scrim-kraft paper that is strong and resistant to flame spread.

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R-Values
Controlling Moisture
Vapor Retarders
Fiber Insulation Needs Air
Ventilation
Controlling Noise
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