Control layers in a building facade are essential components that play a pivotal role in maintaining comfort, energy efficiency, and the overall performance of the structure. These layers are strategically designed to regulate various environmental factors, such as temperature, moisture, air quality, and safety, ensuring that the interior spaces remain comfortable and sustainable. Typically, control layers include insulation to manage thermal transfer, vapor control layers (sarking) to prevent water intrusion and air leakage, whilst regulating vapour diffusion. They work in synergy to create a well-balanced and efficient building envelope.