Guides A-Z

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.

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

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

Guide describing the use of electronically commutated motors (ECMs) in HVAC central air handler fans to reduce power consumption compared to a single-stage fan motor.

Guide describing space planning for emergency supplies storage.

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

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.

No outdoor air intakes connected to return side of the HVAC system, unless controls are installed to operate intermittently & automatically based on a timer and to restrict intake when not in use (e.g., motorized damper)

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

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

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

Guide describing options for adding dehumidification equipment to a home to maintain indoor relative humidity below 60%.

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