Thermal Requirements

•  The Contractor shall ensure the building envelope complies with the following criteria:

•  The entire building envelope shall be thermally broken and no details that allow cold bridging shall be used.  

•  The whole building envelope shall be provided with a continuous air and vapour tight skin layer with a vapour resistance of not less than 200 Mns/g when tested in accordance with BS 3177.  This barrier shall be on the accommodation side of any insulation and may be formed of differing materials at different parts of the construction provided that continuity is maintained in all places. The vapour barrier material shall be non-combustible;

•  The building fabric shall include passive design measures to help limit summer temperatures in areas where air conditioning is not specified; e.g. enhanced window performance, high solar performance glazing systems, brise soleil and enhanced thermal insulation values together with the appropriate building mass.

•  For the avoidance of doubt, the Contractor shall ensure that all such construction shall be in accordance with the requirements of Part L of the Building Regulations.