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Thickness of Insulated Slab Relative to Cavity Insulation

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  • 28-11-2009 9:35pm
    #1
    YourAverageJoe
    Closed Accounts Posts: 136 ✭✭


    HI,

    I have seen on boards before that the insulated slab should not be bigger than the cavity insulation. I have also seen that the insulated slab should only be half of the cavity insulation.

    Any thougths?


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    #2
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    This is a rule of thumb - a guide in the absence of a design calculation using condensation risk software . Some , not all , insulation providers have this software and will provide calculations.

    The aim is to keep the inner leaf as warm as possible because if it cools you condensation can form there . So most of the insulation must be located towards the external .


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