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Wall thermal bridge problem?

  • 17-11-2019 11:24pm
    #1
    ravendude
    Registered Users, Registered Users 2 Posts: 585 ✭✭✭


    Hi,

    I have a lot of concerns with where 2 walls join/tie on an extension I am getting built at the moment. i have attached a photo. There is a step-in on the wall where the 2 walls join. It looks to me like the outer leaf ties/joins with the inner leaf at this point, which seems very weird. I would have expected that this would never be acceptable due to cold bridging and moisture/dampness penetration? ie. I would have thought that the cavity and insulation should be running continuously from one wall to the other.
    I am going to raise this with the engineer - but based on my photo which I have attached and annotated, - does my understanding seem correct? Does this ever need to be done sometimes for any technical reason or as some kind of structural/stability trade off?

    Here is the photo:
    https://drive.google.com/file/d/1ZecPeo5la1d_bA6odnTfRb93NLDGMSQJ/view?usp=sharing

    Thanks once again!


Comments

  • #2
    Bonzo Delaney
    Registered Users, Registered Users 2 Posts: 1,577 ✭✭✭Bonzo Delaney


    ravendude wrote: »
    Hi,

    I have a lot of concerns with where 2 walls join/tie on an extension I am getting built at the moment. i have attached a photo. There is a step-in on the wall where the 2 walls join. It looks to me like the outer leaf ties/joins with the inner leaf at this point, which seems very weird. I would have expected that this would never be acceptable due to cold bridging and moisture/dampness penetration? ie. I would have thought that the cavity and insulation should be running continuously from one wall to the other.
    I am going to raise this with the engineer - but based on my photo which I have attached and annotated, - does my understanding seem correct? Does this ever need to be done sometimes for any technical reason or as some kind of structural/stability trade off?

    Here is the photo:
    https://drive.google.com/file/d/1ZecPeo5la1d_bA6odnTfRb93NLDGMSQJ/view?usp=sharing

    Thanks once again!

    The whole junction is wrong.
    Internal and external leafs should remain continuous and never meet with the exception of wall ties. Same goes for insulation leafs and dpc.


  • #3
    landcrzr
    Registered Users, Registered Users 2 Posts: 150 ✭✭landcrzr


    What's on your drawings?


  • #4
    listermint
    Registered Users, Registered Users 2 Posts: 34,104 ✭✭✭✭listermint


    Cant tell much from the photos. But is that not a window sill?


  • #5
    ravendude
    Registered Users, Registered Users 2 Posts: 585 ✭✭✭ravendude


    listermint wrote: »
    Cant tell much from the photos. But is that not a window sill?

    No, the inner leaf is just up several feet, - not finished yet.


  • #6
    ravendude
    Registered Users, Registered Users 2 Posts: 585 ✭✭✭ravendude


    landcrzr wrote: »
    What's on your drawings?
    There was some change in plan due to existing wall detail when existing was opened/visible.
    Engineer and builder agreed on some detail to join the walls. I don't think this is what was agreed, - but I wasn't clear on all the details.

    I wouldn't rule out that this isn't something the bricklayer has messed up tbh, or cut a corner on and not what he was directed to do.


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  • #7
    SC024
    Registered Users, Registered Users 2 Posts: 585 ✭✭✭SC024


    Bonzo Delaney wrote: »
    The whole junction is wrong.
    Internal and external leafs should remain continuous and never meet with the exception of wall ties. Same goes for insulation leafs and dpc.

    definitley. Whole thing just look like its been done a.se ways


  • #8
    ravendude
    Registered Users, Registered Users 2 Posts: 585 ✭✭✭ravendude


    SC024 wrote: »
    definitley. Whole thing just look like its been done a.se ways

    For sure. Went to engineer who promptly replied to builder that it needs to be rebuilt. Will be keeping a very close eye on this.


  • #9
    selfbuild17
    Registered Users, Registered Users 2 Posts: 125 ✭✭selfbuild17


    Looks completely wrong. Where a new cavity wall meets an old cavity wall, it is usually necessary to chase out a slot of the existing wall so that insulation can be made continuous between the old and new and also to allow a cavity or vertical dpc to be introduced between old and new.


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