We place specific emphasis on the performance of the building details and the additional losses through linear thermal bridging. The thermal value of NVELOPE brackets has been calculated. Thermal bridges cause increased flow of heat and should be taken into consideration when designing a façade or façade system. NVELOPE NV and NH brackets are pre-assembled with thermal isolators. These isolators help reduce thermal bridging. The additional heat loss for each m² of a detail is known as the PSI value and this additional heat loss is dependent upon the type of detail, the thermal conductivity of the cladding materials and the quality of the detail design and installation.