1. Action Plan to Improve Energy Efficiency in the European Community,2000
2. Delivering a Sustainable Energy Future for Ireland, Government White Paper,2007
3. Energy Efficiency and Its Contribution to Energy Security and the 2030 Framework for Climate and Energy Policy,2014
4. Directive 2002/91/EC of the European Parliament and of the Council of 16 December 2002 on the energy performance of buildings, 2003.
5. EN ISO 6946 Building components and building elements – Thermal resistance and thermal transmittance – Calculation method, 2007.