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Guide describing categories of direct-vent combustion space- and water-heating equipment and combustion safety testing.

Guide describing how to provide combustion air for fireplaces and how to test fireplaces for combustion safety.

Guide describing combustion furnaces with selection and installation guidance.

Guide describing condensing boilers and hot water heat distribution systems used for home heating.

Guide describing gas-fired boilers and hot water heat distribution systems used for home heating.

Guide describing the installation of a tankless hot water heater to provide domestic hot water that is heated on demand without the standby losses associated with tank storage water heaters.

Guide describing how to seal roof valleys and how to seal around pipes, chimneys, and other roof deck penetrations.

Guide describing installation procedures for combined space and water heating systems.

Guide describing methods for insulating an unvented attic along the roof line.

Guide describing how ice dams form and how roofs can be constructed to prevent them.

Guide describing causes of condensation in attics and roof assemblies during cold weather and ways to reduce this condensation.

Guide describing methods for insulating an unvented crawlspace or conditioned basement with rigid foam on the interior side of the walls to provide an insulated space for HVAC equipment.

Guide describing how to apply heavy membranes at eaves in cold climates to help guard against ice dams.

Guide describing how to construct homes and decks to manage heavy snow loads in winter weather.

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

Guide describing ways to construct wall assemblies in cold climates to minimize the likelihood of condensation formation inside the walls.

Guide discussing disaster resistance related to asphalt shingle roofing when installing roofing on new construction or when repairing or replacing roofing on existing homes.

Guide describing how to insulate a basement to improve the overall thermal performance of the building and provide more dry, usable conditioned space for home occupants and HVAC equipment.