Design Buy Build Issue 27 2017 - Page 77

The building is naturally ventilated per the Client’s requirements yet achieves the lowest permissible air tightness value of 2.39 m3/h/m2 @ 50Pa- less than half the air leakage of typical property designed to be naturally ventilated. Design CO2 emissions for house are 9kg/ m2/ year compared with a target emissions rate of 17kg/m2/ year under the current Building Standards- a 45% reduction on CO2 emissions compared with the minimum standards. (SAP 2012) The building achieves the Gold Standard for CO2 emissions, Energy for heating water & Energy for thermal comfort under Section 7 of the Building Standards. Primary energy usage is forecast as 63 kWh/m2/ year, equivalent to £448 per year, or £37/month for a 170m2, 3 bedroom property . (SAP 2009) The TEK system helped provide an airtightness value of 2.39 m3/h/m2 @ 50Pa- less than half the air leakage of typical property designed to be naturally ventilated. USE OF MATERIAL AND FINISH t t t Structure built using Kingspan TEK SIPS wall and roof panels Natural materials such as slate roofing and sandstone cladding Energy efficient and maintenance free windows ENERGY EFFICIENY It was important to the client to have an energy efficient home that had low heating costs. Energy efficient products were built into the house including: t t t t Structure built using Kingspan TEK SIPS wall and roof panels All light fittings are low energy LED. Wood burning stove Solar thermal roof installation to supplement the energy demand for hot t t water. Passive solar gain is maximised with large South facing windows. The TEK system helped provide an airtightness value of 2.39 m3/h/m2 @ 50Pa- less than half the air leakage of typical property designed to be naturally ventilated. 33