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

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

Guide describing how to re-roof an existing home with a sloped and add insulation above the roof deck.

Guide describing an approach to re-roofing an existing flat roof to improve thermal, water, and air control performance.

Guide describing how to apply an air control layer directly over existing wall sheathing and cover with two layers of insulating sheathing held in place by vertical furring strips.