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ECOBuilder-Specifiers Journal spring2018

FEATURE ARTICLE: THE

FEATURE ARTICLE: THE PASSIVHAUS TRUST Why choose Passivhaus Efficient thinking on setting standards What is the Passivhaus Standard? Passivhaus is one of the fastest growing global energy & comfort standards for buildings. It offers a voluntary route for anyone that wants to go beyond the minimum efficiency standards stated in the UK building regulations. Passivhaus buildings provide a high level of occupant comfort while using very little energy for heating and cooling. They are built with meticulous attention to detail and undergo a rigorous certification process. The concept originated in Germany in 1996. Since then, over 65,000 buildings have been certified worldwide, and it is a tried and tested methodology proven to work in many climates. Rather than a ‘bolt-on’ compliance test, Passivhaus is a low-tech simple solution focused on integrated environmental design considerations and a diligent build quality. In a UK climate, they are typically super insulated with minimal thermal bridges, draught free and use high performance openable windows along with a highly efficient mechanical ventilation & heat recovery unit, which keeps you warm in winter and cool in the summer. 2 ECOBUILDER - THE SPECIFIER SPRING 2018

FEATURE ARTICLE: THE PASSIVHAUS TRUST Building Performance criteria • The total energy consumption (‘primary’ energy for heating, lighting, hot water, power & appliances) must not exceed 120kWh/m2 per year. • Achieve an annual heating/ cooling demand no greater than 15kWh/ m2 per year, or a maximum peak load of 10W/m2. • Air leakage must not exceed 0.6 air changes per hour at 50Pa test pressure. • Thermal comfort must be achieved in all living areas throughout the year, with temperatures not exceeding 25C for more than 10% of the hours in a given year. What does the Passivhaus standard offer? Comfort & Luxury Passivhaus buildings provide a high level of indoor comfort, maintaining stable temperatures all year round with minimum energy. There are no draughts, mould or condensation. The ventilation system provides constant clean fresh air that is filtered and helps combat air pollution & allergens from entering the building. The super insulated walls & highperformance windows create a peaceful and sound proof environment, providing protection from unwanted exterior noise pollution. These internal comfort factors all aid the health and wellbeing of occupants. Flexibility The Passivhaus Planning Package (PHPP) doesn’t limit your choices in terms of architecture and materials; A Passivhaus can be built from any construction method, providing a flexibility to easily fit many building contexts. The Standard can be applied to any type of building, from residential to non-domestic, new-build to retrofit. The pictures illustrate the various scales and styles of Passivhaus buildings completed in the UK. For further examples visit the Passivhaus projects gallery or find a certified Passivhaus near you with the Trust’s project map. The first UK Passivhaus, Y Foel Passivhaus, was certified in August 2009 in Powys, Wales. ECOBUILDER - THE SPECIFIER SPRING 2018 3

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