The current version of National Calculation Methodology for determining the CO2 emissions using BRE iSBEM method has been updated to v2.0.c. The key changes are identified in the BRE iSBEM – User Guide – dated 18th May 2007. The principal changes which alter the guidance given in Technical Paper 17 Design guide for metal roofing and cladding to comply with the energy requirements of UK Building Regulations (2006) are given in MCRMA Technical Bulletin No 14.

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