Two two-bedroom flats of around 65m2 have been built at 36b Mid Street in South Nutfield, Surrey. They were been built by Osborne for Raven Housing Trust, using the Innovare i-SIP system. The overall cost of the build was £2,610/m2; approx 20% more than the cost of building to Code Level 3 (the minimum standard for housing associations at the time of construction). The additional cost was part subsidised by the constructor's Carbon Offset Fund.
Construction techniques improved the sustainability of the build by reducing waste and pollution. The SIPS system (Structurally Insulated Panel System) allowed swift construction of the building, reducing construction time. The i-SIP system uses a sandwich of Oriented Strandboard (OSB) with a recyclable expanded polystyrene (EPS) core. OSB is a waste timber product which is also recyclable, unlike the polyurethane used in some SIPS products.
The building is highly insulated (wall: U=0.14W/m2K; roof U=0.11 W/m2K), with triple glazed windows filled with inert gas. Rainwater is harvested and used for the toilets, washing machines and garden taps. The air tightness of the build is: ground floor: 4.36 m3/m2/hr at 50 Pa; first floor: 5.53m3/m2/hr at 50 Pa.
Awards and Achievements
- Photovoltaic panels generate approximately 900 kWh/year.
- Biomass wood pellet boilers generate a heat output of up to 28KW.
- Mechanical ventilation heat recovery (Xpelair Xcell270 Long Life Heat Recovery Unit).
The build achieved Level 5 of the Code for Sustainable Homes.
Links / Contact Details
Page last updated: 23 August 2010