This lecture covers the principles of wooden structures, focusing on frameworks and roofs. The instructor discusses the importance of printing exercises at the correct scale and introduces the concept of the wooden skeleton, known as the framework. The role of carpenters in constructing these frameworks is highlighted, along with the distinction between wooden and steel frameworks. The lecture explains various types of beams and their representations, including composite beams. The instructor elaborates on the concept of flooring systems, emphasizing the spacing of beams and the use of joists. The lecture also addresses the construction of sloped roofs, detailing the layering of tiles and the necessary support structures. The importance of understanding load distribution and the interaction between different structural elements is emphasized throughout. The session concludes with a discussion on the design and assembly of roof structures, including the use of purlins and trusses, ensuring a comprehensive understanding of wooden construction techniques.