Glass surfaces are characteristic façade elements and contribute significantly to the authenticity of architectural monuments. The material glass is considered an important testimony of its time. Depending on the manufacturing process, it differs both in surface and material composition. The period of high modernism (ca. 1880-1970) overlapped with the technical developments of the industrial revolution, which led from handicraft to industrial production. The further development of manufacturing processes as well as the dimensions and qualities of glass thus shaped the development of glass constructions, which had to become increasingly slender over time in order to ensure a high degree of transparency. Nowadays, historic windows are often replaced by new glazing made of float glass, which can cause the authentic character of buildings to be lost. A research team from the Technical University of Dresden and the University of Bamberg has therefore set itself the goal of examining glass and its construction in detail in the period from around 1880 to around 1970 and defining the living character of industrially manufactured glass from the time before the introduction of float glass as an authentic and style-forming feature of the era. The present work deals with investigations on historical glass and glass constructions in a selected study area. The aim was to be able to make quantified statements about the inventory. From the results and the evaluation, the importance of historic glass constructions can be deduced for engineers, planners and monument conservators, who can contribute a great deal to the preservation of historic glazing.