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Guide describing how to insulate a vented attic in an existing home using blown insulation added to the attic floor.

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

Guide describing application of a radiant barrier layer in the attic to block radiant heat transfer between hot surfaces and heat-absorbing surfaces.

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

Guide providing guidance on insulating attic eaves in new and existing single-family homes and multifamily buildings.

Guide describing how to apply spray foam insulation to the floor of the attic in existing homes.

Guide describing how to air-seal and insulate a ceiling where the insulation is installed on top of the ceiling (on the attic floor) in a vented attic.

Guide describing how to air-seal attic access panels, doors, and stairs to provide a continuous air barrier at the ceiling.

Guide describing how to insulate and air-seal dropped ceilings and soffits to prevent air leakage.

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 how to install a bathroom exhaust fan to remove excess moisture.

Guide describing how to correctly air-seal a wall with missing top plates or open wall cavities.

Guide describing how to install an efficient kitchen exhaust fan.

Guide describing the installation of insulating sheathing above the roof deck on existing homes. This retrofit assembly is appropriate for homes with conditioned attics or where the retrofit is intended to create a conditioned attic.

Guide describing how to air-seal bathroom and kitchen exhaust fans.

Guide describing how to install a radon mitigation fan to actively remove radon from the home.

Guide describing how to install back-draft dampers in exhaust fans to make a shared duct possible.

Guide describing methods to keep birds, rodents, and other pests out of vent openings and other locations in new and existing homes.

Guide describing how to apply self-adhered asphaltic membranes at eaves in cold climates to help guard against ice dams.

Guide describing the repair and reconfiguration of the air handler closet and platform when replacing the air handler.