The TETRA project aims to increase knowledge about the reuse of insulation materials from demolition and take concrete steps to lower technical and practical barriers. In doing so, the project aims to increase confidence within the construction industry to use reused insulation materials safely and efficiently. This project provides valuable insights and tools to accelerate the transition to circular construction, reusing insulation materials without loss of quality or performance. This will be achieved by: • Measuring the technical performance of insulation materials from at least 20 case studies and 160 tests, comparing them with contemporary standards and understanding the impact of damage caused by bonding, manipulation, or perforation. • Developing 3D step-by-step plans, guidelines, and implementation tools for the efficient dismantling of four types of insulation materials and four types of superstructures, along with decision trees for safe reuse in different applications. • Creating and testing simple, fast, and low-cost procedures to assess technical performance, with at least four proof-of-concept methods for determining thermal conductivity and mechanical resistance by the project’s end. • Translating accumulated knowledge into a digital tool, making it accessible and practical for the entire construction sector, enabling the broad application of reuse principles.