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| Building Regulations / Standards for the Conservation of Fuel & Power |
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| The requirements for
thermal insulation (Conservation of fuel and power) in buildings are
detailed in the following Regulations/Standards. The aim of these
Regulations is to further promote the energy efficiency of buildings. England & Wales The Building Regulations 2001 (England and Wales) Approved Documents L1 & L2 (Conservation of fuel and power). The latest revision to these Regulations came into effect April 1, 2002. Scotland The Building Standards (Scotland) Regulations 1990 Technical Standards Part J (Conservation of fuel and power). The latest revision to these Standards came into effect March 4, 2002. KEY POINTS U–values have to be calculated using the new Combined Method. All the U–values in this booklet have been calculated using the Combined Method which has been adopted to bring National Standards in line with the European Standard calculation method BS EN ISO 6946: 1997 (Building components and building elements. Thermal resistance and thermal transmittance calculation method) for walls and roofs and BS EN ISO 13370: 1998 (Thermal performance of buildings. Heat transfer via the ground. Calculation method) for floors. EASY GUIDE TO APPROVED DOCUMENTS L1 & L2 (2001)/ TECHNICAL STANDARDS PART J (2001) BASED ON THE ELEMENTAL METHOD OF COMPLIANCE |
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| * A U–value of 0.30 W/m².K
is allowable for material alterations (e.g. loft conversions). ** Depending on type of frame. *** Dependent on SEDBUK rating of heating system. |