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 and insulate a ceiling where the insulation is installed on top of the ceiling (on the attic floor) in a vented attic.

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

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

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

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

Guide describing insulation techniques for skylight shaft walls.

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

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

Guide describing options for insulating and air sealing at either the attic floor or along the roof line in new homes.

This guide describes how to install a rigid air barrier to separate the porch attic from the conditioned space.