Inspired by experimental solar houses developed after the 1970s oil crisis, the Passive House certification emerged in the late 1980s as a response to growing concerns about energy efficiency and the environmental impact of the construction industry. Its goal is both simple and radical: to reduce heating and cooling demands to an absolute minimum through passive strategies, controlled mechanical ventilation, and an extremely efficient building envelope — eliminating the need for complex or expensive systems.
The choice of exterior cladding materials plays a strategic role in achieving this performance. Poorly designed surfaces, thermal bridges, or sealing failures can undermine the building's entire thermal logic, especially in demanding climates. This is where rainscreen systems stand out: by creating a ventilated air gap between the cladding and the structural wall, they promote continuous airflow, manage moisture, and enhance thermal stability. Materials that combine performance, durability, and visual appeal are rare — and natural slate from Spain's Cupa Pizarras is a standout solution.
