This manual, Structural Fire Protection: Manual of Practice (Manual and Report #78), is intended to provide a basis for the development of new standards for the calculation of the fire resistance of structural members. It provides information on current techniques and developments to improve fire safety in buildings. While it deals mainly with structural fire safety, related subjects are also discussed. The manual consists of two parts. The material in Part 1, which consists of three chapters, is mainly descriptive. Chapter 1 deals with various aspects related to structural fire protection, including building codes and the role of structural fire protection. Chapter 2 discusses the development of fire in enclosures and the effect of fire on the behavior of concrete, steel, and wood, including the properties of these materials at elevated temperatures. Chapter 3 describes methods for the calculation of the fire resistance of various structural members. Part 2, which consists of Chapters 4 and 5, deals with the development of fire and the calculation of fire resistance using mathematical models, respectively. It is hoped that, in addition to providing a basis for new standards, this manual will also be useful to architects, engineers, building officials and students in any branch concerned with structural fire safety.