Shawky Saifelnasr, Shady2023-04-042023-04-042023Faculty of Engineeringhttp://repository.msa.edu.eg/xmlui/handle/123456789/5474The overall thermal resistance of a building envelope cross-section; vertical or horizontal, is crucial for providing insulation for indoor spaces to reduce heat transmission, which would lower energy usage. The main objective of this paper is to create a design chart that determines the overall thermal resistance of vertical or horizontal cross-sections that constitute a building envelope. Additionally, it can determine the appropriate insulation needed to achieve the desired overall thermal resistance. The design chart is made up of several integrated graphs that are created using various formulas, with each graph illustrating the resistance of a particular building material as a function of its thickness. Using the design chart to determine the overall thermal resistance of vertical or horizontal cross-sections is simple for architects to do without having to perform several calculations. It is also universal since it may satisfy the needs of the various energy regulations across the globe.enThermal Resistance,Design Charts,Insulating Materials,Thermal Properties,Building Envelopes.MSA UniversityOctober University of Modern Sciences And ArtsArticle