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    • #30495

      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.


    • #32912

        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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