Passivhaus buildings achieve their energy efficiency through a set of core design principles. Each one plays an important role in reducing heat loss and improving comfort.
When these elements work together, the result is a building that uses far less energy than conventional construction.
High Levels of Insulation
Insulation forms the foundation of the Passivhaus approach.
Thick layers of insulation are installed throughout the walls, roof and floors. This slows the movement of heat, helping the building maintain a stable internal temperature.
Continuous insulation is particularly important because gaps in insulation can allow heat to escape.
Airtight Construction
In many traditional buildings, small gaps allow warm air to leak outside and cold air to enter.
Passivhaus construction focuses on sealing these gaps. Special membranes, tapes and sealing systems are used to create a continuous airtight layer.
This prevents uncontrolled air leakage and helps maintain indoor comfort.
High Performance Windows
Windows can be a major source of heat loss in buildings. Passivhaus homes use high performance windows designed to reduce this loss.
Triple glazing is often used, along with insulated frames and careful installation methods.
Window placement is also considered carefully so the building can benefit from solar heat during colder months.
Thermal Bridge Free Construction
A thermal bridge occurs when heat escapes through a part of the building structure that conducts heat more easily.
Common examples include structural junctions, balconies or poorly insulated edges of floors and walls.
Passivhaus design aims to remove or minimise these areas so heat cannot escape through these weak points.
Mechanical Ventilation with Heat Recovery
Because Passivhaus buildings are airtight, ventilation must be controlled.
Mechanical ventilation with heat recovery systems supply fresh air while capturing heat from the air leaving the building.
This ensures good indoor air quality without losing valuable warmth.
When these five principles are combined, they create buildings that remain comfortable while using significantly less energy.
