| Montgomery School | Case study | 1 Sustainable design The PassivHaus standard (first developed in Germany) requires ultra-low energy consumption and high thermal performance, delivering an efficient and comfortable space for occupants. To achieve this we had to create a building with super insulation, eliminate thermal bridging and reduce air leakage. Not only did we meet the PassivHaus standard but we also surpassed many of the requirements: ¦ Annual space heating only requires 12 kWh/ m 2 instead of the standard 15 kWh/m 2 ¦ The heating load is 9 W/m 2 instead of the standard 10 W/m 2 ¦ Air tightness achieve 0.68 m 3 /hr/m 2 instead of the already tough 1.2 m 3 /hr/m 2 ¦ Total primary energy demand for a year is 112 kWh/m 2 instead of 120 k

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