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Cost of wider cavity

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  • 22-10-2012 4:48pm
    #1
    rockabaloo
    Registered Users Posts: 103 ✭✭


    Does anybody have any sort of idea how much extra it would cost to build with a 150mm cavity instead of a 100mm cavity. Or even a 200mm cavity instead of 150mm.

    I know it will depend on the overall size of the house, house type and area but does anybody have any rough figures or examples?

    Cheers.


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    #2
    mal_1
    Registered Users Posts: 163 ✭✭mal_1


    Theorictially an increase in cavity width will cost nothing as it an air gap, and normally the external dimensions of the house would but set by site or planning and you be decreasing the internal area of house , which be a saving; but I know that is not what you asking. Simply put, if you increasing your insulation layer by 50 - 100% it's a multiplication of the insulation costs. Also allow for speccing up your ties, deeper window cills or boards depending how it is detailed. So yes it's all back to the size of the house.


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    #3
    rockabaloo
    Registered Users Posts: 103 ✭✭rockabaloo


    Say then, for example, a 200 square metre house. How much extra would it be to build with a 150mm cavity instead of a 100m cavity?

    And if you go to 200mm I am led to believe the cost would jump up significantly because of the extra foundations, non-standard wall ties and lintels, etc.

    Would you be talking hundreds extra or thousands?


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    #4
    mal_1
    Registered Users Posts: 163 ✭✭mal_1


    100mm insulation is give or take 10-12€ per sq m. Considering the size given you have maybe 200- 250m2 external surface area thus the bill is 2.5k so increase that figure by 50 or 100%
    The foundation change wouldn't be too significant. Say hundreds if that.

    Not a qs so don't these hard figures


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