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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

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

Guide describing how to air-seal duct and flue shafts.

Guide describing how to increase insulation in existing homes by installing batt insulation on the ceiling plane of a vented attic.

Author(s)

Pacific Northwest National Laboratory

Organization(s)

PNNL

Publication Date

April, 2012

Case study describing the design and testing of 10 high-performance homes in Farmington, Connecticut.