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What would approximate wall u value be?

  • 22-11-2013 9:49pm
    #1
    Atlantic1
    Registered Users, Registered Users 2 Posts: 368 ✭✭


    I have a cavity block house. Some of the walls have been insulated with Kingspan 62.5mm TW 52 insulated plasterboard (thermal conductivity 0.26). I should have used TW56 (thermal conductivity 0.22) which is foil backed but I've been through all that......... :(

    What u value would these walls have if I also put on Kooltherm K5 70mm phenolic external insulation (thermal conductivity 0.21) on the outside?

    To help anyone who'll try to calculate, Kingspan have calculated that the walls currently have a u value of 0.41.

    Ordinarily, 70mm of Kooltherm on its own would give the walls a u value of about 0.25.

    For those of you with concerns about using phenolic insulation, I'd be happy to use EPS instead. That would give a u value of about 0.27 on its own.

    Thanks.


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