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Glossary: Know the Terms

R-Value: A measure of how effectively a material resists heat flow. Thus, higher numbers are better. For a full list comparing various types of insulation, visit www.coloradoenergy.org.

Batt: A length of insulation that is precut to fit certain wall cavity dimensions. Typically sold in a pre-packaged roll.

Unfaced/Faced Insulation: Faced insulation (typically a fiberglass batt) includes a vapor retarder on the interior face that restricts movement of moist air into wall cavities. Unfaced is simply a batt without a vapor retarder.

Ridge Vent: An opening covered by a rainproof vent that follows the peak of the roof, typically required by code. Some insulating methods, however, negate the need for a ridge vent. Clear it with your local code official first.

Blow-In: Method of introducing loose fiberglass, cellulose or mineral wool to framing cavities or attic space, typically using a machine with an attached hose.

Blower Door: Equipment used to test the effectiveness of a home’s insulation and air sealing systems.

Stud Cavity: The space between the vertical members of a conventionally framed wood or lightweight steel home. Common stud spacings include 16” and 24” on center (of stud).