Abstract
Reusing building materials is essential for advancing toward a more circular construction industry. Mineral wool insulation, widely used for its durability and standardized format, demonstrates significant potential for reuse. However, significant amounts of this material are currently discarded rather than reclaimed. This paper offers two complementary contributions. First, this study presents laboratory tests on reclaimed mineral wool samples, aged between 5 and 30 years and sourced from various Norwegian buildings. Key properties, including density and thermal conductivity, were measured to assess the material’s condition after long-term use. Test results indicate that mineral wool, widely used in the Norwegian market, maintains adequate thermal performance over time, with only slight changes in density and thermal conductivity, as long as it is protected within the building envelope and not exposed to prolonged moisture or dust. Second, the study proposes an assessment framework for evaluating the reusability of reclaimed mineral wool insulation. The framework outlines stepwise criteria based on material performance and compliance with national and international regulations, based on literature, standards, and regulatory requirements. It is intended as a decision-support tool that can be applied across diverse testing contexts. This study supports the broader adoption of reclaimed materials in construction by providing both empirical evidence on the performance of reclaimed mineral wool and a structured assessment framework. These insights aim to support industry stakeholders and regulatory bodies in implementing circular economy practices more effectively.