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A floor cavity between the first and second floor can provide a conditioned space for HVAC ducts if the rim joists are insulated and air sealed, if sufficient space is available, and if open-web floor joists are used

Publication Date

Wed, 01/01/2014 - 12:00

Ducts in Interstitial Floor Framing

Guide for designing and installing interior ducts in an interstitial floor cavity in new and existing homes.

No Ducts or Air Handlers Located in Garage

Guide describing how to design HVAC systems to be located within the conditioned space of the home, either in a utility closet or in an air sealed conditioned attic, basement, or crawl space.

Building Science Introduction - Air Flow

Information guide providing background information about air flow in residential buildings.