The book covers the basic concepts and science and engineering fundamentals in the analysis, design and retrofit of building envelope. Micro and macro outdoor climate including wind and precipitation and indoor climate requirements are included. Architectural considerations Architectural considerations of building shape, geometry and facade orientation are included. fenestration, joints and sealants are presented. Structural considerations of wind loads and differential movements along with design of brick veneer and stone cladding are covered. The book covers thermal design of building envelope and effect of insulation, fenestration, thermal mass and thermal bridging are included. Vapor diffusion analysis and need of vapor barrier are covered. Condensation accumulation analysis and control strategies for condensation are presented. Air flow through building envelope and the need of air barrier are covered. Resistance to rain penetration and strategies to prevent and limit rain penetration including cavity and screen walls are presented. Roofs and below grade walls are also included. Evaluation, retrofit and maintenance of building envelope are briefly presented along with case studies.