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Insulated floor above garage - cavity insulation with 1 inch rigid insulation with 2x2 wood furring

Guide describing buried ducts in loose-fill attic insulation, a method that can only be used in dry climates.

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

Air Sealing Duct and Flue Shafts

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

Building Code Training - Residential Thermal Envelope - Air Sealing

Author(s)

Southface Energy Institute

Organization(s)

SEI

Publication Date

May, 2020

Presentation describing the Georgia State Minimum Standard Energy Code air barrier requirements, envelope concepts including air flow and thermal properties, and common missed insulation and air-sealing opportunities.

Right - The rigid metal HVAC ducting is installed between the floor joists rather than in an unconditioned attic or crawl space to minimize heat loss.

Ducts in Interstitial Floor Framing

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

Sealing Duct Boots to Floor or Drywall

Guide describing how to air seal around duct shafts and flues installed through ceilings, walls and flooring in new and existing homes.

New Whole-House Solutions Case Study: Nelson Construction: Hamilton Way, Farmington, CT

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.