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Guide describing approaches to burying and encapsulating ducts in unconditioned attics to increase the overall R-value of duct insulation.

Guide describing how to add spray foam insulation to the underside of the existing roof deck as part of the conversion of a vented attic to an unvented, insulated attic.

Vapor retarder plastic should not be installed over fibrous insulation on basement or crawlspace walls unless rigid foam or spray foam is installed directly against the concrete, behind the blanket insulation.

Guide describing a method for insulating an unvented attic by spraying foam insulation along the underside of the roof deck.

Guide that illustrates how and when to encapsulate ductwork in unconditioned attics, increases the R-value of duct insulation, mitigating condensation issues and reducing air leakage.

Guide providing information about treating bulk water drainage issues and moisture control measures in existing basements and crawl spaces.

Guide describing steps to take to minimize indoor humidity in preparation for cold winter weather.

Guide describing the use of building cavities as supply or return ducts.

Guide describing how to select and install whole-house ventilation systems for existing homes.

This guide describes how to install a whole-building ventilation system to provide adequate dilution of indoor air contaminants.