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External insulation and new extension

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  • 27-02-2015 9:32pm
    #1
    pattwoie
    Registered Users Posts: 34 ✭


    Planning on significant renovations and extension to a 3-bed semi-d from 1950s in Artane, Dublin.
    Includes 30 sqm extension to rear of house.
    Planning on external insulation of existing house using 120 mm of Kingspan Thermawall TW53.

    Question is how to tie this with existing house:
    1. Do extension in normal cavity wall construction with insulation in cavity - different to plans for existing part off house
    2. Do block wall (on flat) with external insulation - similar to plans for existing part off house
    3. Other

    One concern with doing external on extension (2) is fact one wall is very close to boundary wall
    of neighbour (neighbour also has an extension).
    Worry of architect technician we're using is
    A. How to avoid cold bridges and
    B. if adding of external insulation to wall closest to boundary wall is physically possible due to lack of access

    Any advice would be much appreciated.
    Tagged:


Comments

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    #2
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,140 Mod ✭✭✭✭BryanF


    What's the boundary construction?


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    #3
    Calahonda52
    Registered Users Posts: 12,237 ✭✭✭✭Calahonda52


    A variant of this was up earlier this year.
    The view was to go EWI all the way, new and old.
    In you case move the boundary wall in far enough to allow it be EWI'd and live with the thermal bridge, perhaps dry wall internally on the corner

    “I can’t pay my staff or mortgage with instagram likes”.



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    #4
    pattwoie
    Registered Users Posts: 34 ✭pattwoie


    BryanF wrote: »
    What's the boundary construction?

    4" block on edge I think. Very basic boundary wall.


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    #5
    pattwoie
    Registered Users Posts: 34 ✭pattwoie


    Calahonda52 wrote: »
    A variant of this was up earlier this year.
    The view was to go EWI all the way, new and old.
    In you case move the boundary wall in far enough to allow it be EWI'd and live with the thermal bridge, perhaps dry wall internally on the corner

    Is this the one you were referring to?
    New ish user so can't post a link yet so here my attempt around it
    boards.ie/thread/2057374665/1

    Thanks for the pointer.
    Hadn't found it in my earlier search.
    From that it looks like extension should be block on flat with EWI on both new and old


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