As we now know it the new Part L building regs requires a 25% reduction in carbon emissions compared with the 2006 version. Obviously this will have a dramatic effect on walls and on cavity walls in particular. For example, Celotex states that you will need 165mm of mineral wool insulation which is a 65% increase. When Part L is tightened again in 2013 the issue becomes even tighter. Its all about thermal bridging which neatly brings us to timber frame construction and solid masonry walls which are simpler to build and take up less space. Celotex with Building magazine has assembled a panel of experts to debate. The findings are out on the 15th of October 2010.
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