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Air Sealing Duct and Flue Shafts

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

Cantilevered Floor

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

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.

Wind Washing

Guide describing wind washing and how to prevent it.

Floor Above Unconditioned Basement or Vented Crawlspace

Guide describing how to air-seal and insulate the floor above an unconditioned basement or crawl space.

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.