One of the chief reasons of weatherproofing failures of facades is the thermal stresses and associated movements in excess of seals’ elastic capacity. This is particularly true for metal curtain walls, because of large discrepancies of thermal coefficients of materials involved in their construction.
Fatigue of metal components, and spalling of brick and stone facades caused by thermal cycles affect safety, because these components may fall from great heights. This was the case with the solid aluminum rods shown on the pictures, which were observed falling on sidewalks from 40-story+ skycraper, prompting the forensic investigation, while the building was still under construction.
Thermal stress imposed on the façade elements, self-shading, inadequate glass- insulation spacing, as well as freeze-thaw damage cause deterioration and inferior performance. This is why we provide thermal stress analysis of curtain walls and other facade components.