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Install rigid insulation and finish material below the framing and cavity insulation of a building overhang

Publication Date

Mon, 07/01/2013 - 12:00

Insulating and Air Sealing Existing Floors above Unconditioned Spaces

Guide describing how to insulate a floor over unconditioned space with conditioned space above by adding insulation and air-sealing.

Batt Insulation for Existing Vented Attics

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

Floors: Above Unconditioned Basement, Vented Crawlspace, Cantilevered Floors, and Floors above Garage, Code Compliance Brief

New language in the 2015 IECC allows different installation of insulation in floors over unconditioned spaces.

Cantilevered Floor

Guide describing how to air-seal and insulate a cantilevered floor.

Floor Above Garage

Guide describing how to create an air barrier between the garage and the conditioned space above it to prohibit pollutants from entering a home's interior.

Air Sealing Duct and Flue Shafts

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

Sealing and Insulating Existing Floors above Unconditioned Spaces - Code Compliance Brief

Publication Date

May, 2016

From a model code perspective, submittal of construction documentation, permitting, plan review, and field inspection may be required depending upon the specific details of renovating the floor above an unconditioned space (e.g., floor over a vented crawl space). Several different approaches can be taken to seal and insulate existing floors during a renovation project.