upgrade
PROJECT OVERVIEW Building type: A three-storey block containing six low rise flats of concrete and brick construction. Retrofitted to the Enerphit standard using the Beattie Passive TCosy system. Innovate UK funded project. Location: Chelmsley Wood, Solihull, UK Completion date: June 2016 Budget: £625,000 Passive house certification: Enerphit certification pending Space heating demand (PHPP): 24 kWh/m2/yr Heat load (PHPP): 14 W/m2 Primary energy demand (PHPP): 121 kWh/m2/yr
Thermal bridging: Thermal bridging was eliminated by use of the TCosy system, with a continuous layer of insulation around the building. Insulation continued below ground and windows were installed in the insulation layer. Ground floor: 150mm Concrete ground floor uninsulated as before. U-value: 4.082 W/m2K Walls: Beattie Passive timber frame system, as below. U-value: 0.099 W/m2K Above ground: Pre finished render board externally followed by battening, breather membrane, 50mm Kingspan Kooltherm K5 insulation, 12mm Versaliner, timber frame filled with platinum Ecobead, airtight membrane to existing masonry.
Energy performance certificate (EPC): Pending
Below ground: 12mm plastic skirt, followed inside by battening, breather membrane, 50mm EPS insulation, 12mm Versapanel, timber frame filled with platinum Ecobead, Monarflex DPM membrane lapped with airtight membrane on existing masonry.
Measured energy consumption: Monitoring equipment in place will allow post-completion data to be compared to a year of pre-project data
Roof: Beattie Passive timber frame system. Felt roof covering, followed underneath by 12mm plywood, 75mm EPS insulation, 12mm plywood, timber
Airtightness (at 50 Pascals): 0.93 ACH at 50Pa
construction 220mm Ecobead insulation, air tightness membrane, 18mm plywood, 50mm wood wool insulation, on 220mm concrete. U-value: 0.1 W/m2K Windows: Triple-glazed Elwiz Energio passiv PHI certified PVC window. U-value: 0.9 W/m2K Entrance door: Fully welded stainless steel communal entrance door with an African close grain cedar core, including double-glazed argon filled sealed units. Glazing U-value: 1.1. Frame U-value: average of circa 4.3. There were some very significant thermal bridges as part of the construction of the door, which was chosen for secutity purposes. Care was taken to ensure the seals – rubber gaskets around the frame and the magnetic locking system – were as airtight as possible. Heating system: 90% efficient individual gas boilers to each unit, supplying existing radiators Ventilation: Heinemann Vallox KWL90 MVHR system. PHI certified heat recovery efficiency of 79%. Ductwork installed in insulation layer with MVHR units in external insulated cupboards accessible by the housing association.
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