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Friday, December 8, 2023

Largest Passivhaus-certified public building completes

Richmond Hill Primary School, built on behalf of Leeds City Council, will use up to 80 percent less energy than a conventionally built equivalent facility, reducing carbon emissions by 60 percent without the use of renewable energy.


The school for 630 pupils completed in Leeds by Interserve, the international support services and construction group, has not only achieved Passivhaus certification, but has smashed the air tightness target of the Passivhaus Institute. The new school was given a Passivhaus air tightness target of 0.6 ACH (Air Changes Per Hour), which means the building must not leak more than 0.6 times its volume of air per hour at 50 pascals. This level of air tightness is well over ten times better than the current building regulations?? requirement of 10m3/m2/hour at 50 pascals. However, tests have revealed the school has achieved an enormously impressive 0.25 ACH, which is just 1/20 of the ACH level required by British Building Regulations.


Superb levels of insulation, coupled with a highly efficient mechanical ventilation heat recovery (MVHR) system have all contributed to the building achieving its Passivhaus certification. Helping to achieve superior levels of thermal insulation is Interserve??s solution for the eradication of cold bridging between the building??s piled foundations and steelwork frame, using high-strength insulation normally used in industrial process plant installations.


The walls and roof of Richmond Hill School achieve excellent thermal insulation performance, with U-Values far exceeding the requirements of the current building regulations. Structural Insulated Panels (SIPs) manufactured off-site featuring polyurethane insulation have been used to form the structural fabric of the walls, and further SIPs panels with extra mineral wool insulation form the roof of the new building. The materials enable an impressive U-Value of 0.1W/m2K to be achieved for the walls.


Triple glazed timber windows, certified by the Passivhaus Institute, facilitate excellent standards of thermal insulation, whilst also helping to keep air leakage to a minimum. The specific heat demand of the building is 11kWh/m2/year (well under the target of 15kWh/m2/year) and the Primary Energy Demand is 112kWh/m2/year (again, well below the target set of 120 kWh/m2/year); therefore the school will benefit from lower energy costs.


The school also features a twenty-six place nursery and an integral sixteen-place Autistic Spectrum Condition facility.


Richmond Hill Primary School is the third non-domestic Passivhaus-certified building constructed by Interserve, and is thought to be the largest Passivhaus-certified building in the UK. The School has also recently won the Yorkshire and Humberside Constructing Excellence Innovation Award.




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