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    • 11 October 2006 at 4:18 pm #30495
      Paul Kent

        I have been specifiying a partial fill concrete block cavity wall:-
        Gypsum plaster 13mm
        100mm 7N standard concrete block
        150mm celotex Rcw3000
        50 mm low emissivity cavity
        100mm 7N standard concrete block
        13mm sand cement render

        Can anyone explain why different calculating softwares come up with totally different results

        Builddesk U3.2 reckons this comes out at 0.018
        whereas celotex believe I can acheive the same result with only 110mm

        both software packages seem to be catering for fixings and air gaps

        Any one know of a software package I can trust.

        Paul

      • 11 October 2006 at 6:06 pm #32912
        Anonymous

          Sorry Paul

          Re-reading this, I have assumed you are after a u-value of 0.18W/m2K. – Have I got this right?

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