Roofs, Attics & Ceilings -

Attics

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

Guide describing how to air-seal duct and flue shafts.

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

Guide describing how to insulate and air-seal attic knee walls and floor joist cavities under knee walls.

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

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

Guide describing buried ducts in loose-fill attic insulation, a method that can only be used in dry climates.

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

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 how to install insulation below attic platforms

Guide describing how to apply spray foam insulation to ceilings in existing homes.

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

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

Guide describing options for designing and locating the thermal boundary at either the attic floor or along the roof line in new and existing homes.

Guide describing the types of whole-house fans, installation details to reduce energy loss, and how to operate them for comfort and energy savings based on climate zone.

Guide describing wind washing and how to prevent it.