The state and operation of the building envelope--walls, roofs and foundation--are analyzed as well as the physical process components: heat, moisture and air transfer. These physical transport processes determine the performance of the building. Thorough knowledge of building physics is essential for planning and constructing sound, energy-efficient buildings with high levels of comfort and durability. This book will help the reader anticipate the performance and consequences of alternate designs as well as determining technical solutions before critical design and construction decisions can be made. The focus of this text is on the theories behind the physical problems which may arise and offers mathematical models to arrive at needed solutions. (Ingram)