Making cities resilient and sustainable is only possible if the energy consumption of buildings is reduced. Retrofitting is one of the main tools of the environmental policies developed in cold and temperate climates, leading to the replacement of products considered inefficient. This is particularly the case for glazing, which is a key element in the energy system of a building. However, most of the glass waste generated by renovation is landfilled while the development of a circular economy in the glass industry seems today highly challenging. This paper studies barriers and opportunities to increase the recycling and repair of insulating glass units. To do so, we follow three approaches: a literature review, a series of interviews and a case study of a glazed office district in Brussels. This article provides a comprehensive overview of the main issues relating to the management of glass waste in the building sector and underlines the importance of economic instruments to support the spread of sorting and recycling practices. The need to rethink the systems for assembling insulating glass units with a view to facilitating the sorting of their components also appears as a necessary and stimulating path.

只有减少建筑物的能源消耗，才能使城市具有弹性和可持续性。改造是在寒冷和温带气候下制定的环境政策的主要工具之一，导致更换被认为效率低下的产品。玻璃尤其如此，它是建筑物能源系统中的关键要素。然而，翻新产生的大部分玻璃废料都被填埋，而玻璃行业的循环经济发展在今天似乎极具挑战性。本文研究了增加中空玻璃单元回收和修复的障碍和机会。为此，我们采用了三种方法：文献回顾、一系列访谈和布鲁塞尔玻璃办公区的案例研究。本文全面概述了与建筑行业玻璃废物管理相关的主要问题，并强调了经济手段对支持分类和回收实践的传播的重要性。重新考虑组装中空玻璃单元的系统以促进对其组件进行分类的需求也似乎是一条必要且令人振奋的途径。