The Saturn Building Shell Field Guide describes the best practices for improving the efficiency and durability of the building shell in existing homes. It includes step-by-step procedures for air-sealing and insulating attics, walls, basements, and crawl spaces. It also includes detailed instructions for performing advanced blower-door diagnostics. This Saturn Building Shell Field Guide includes six chapters and an extensive appendix. * Diagnosing Shell and Duct Leakage * Air Sealing Homes * Installing Insulation * Improving Windows and Doors * Improving Mobile Homes * Health and Safety The Saturn Building Shell Field Guide provides specific instructions for optimizing the performance of the building shell in residential and light commercial buildings. It is used in the field by insulation and air sealing crews, and as a study guide for students in building performance courses.