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Guides A-Z

This guide provides information about installing 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 a method for insulating an unvented attic by spraying foam insulation along the underside of the roof deck.

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 add spray foam insulation to the underside of the existing roof deck.

Information guide describing how to calculate ventilation area in existing roofs.

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

Information guide describing how to assess attics, ceilings and roofs before proceeding with upgrades in existing homes.

Guide describing insulation techniques for skylight shaft walls.