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Housing - Renovation: Increasing Eave Overhang for EWI

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    Hello all,

    I am completely stripping the roof and as I do I want to plan for EWI. I was hoping I would just be able to extend from existing rafters but they stop close to the internal wall and the previous tiles (last row) were cemented on to give the previous overhang.

    Does anyone know of a trick to increase eaves without extending from the existing? I thought about putting a vertical wall plate on, but the issue is we have some brick detail so there isn't room.

    Searched for diagrams but can't find anything.

    Then I will be starting on the gable ends, but I think this will be a simple notch and ladder? Though I haven't seen many done with flush gable end chimneys...

    Thanks
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    Alumasc/K Rend do a combined capping detail/gutter, but I think there is still a risk of thermal bridging. A lot depends on gutter height versus internal FF ceiling height.
    • CommentAuthortony
    • CommentTimeDec 29th 2019
     
    Extend new battens out and fix a rafter to all of them outside the line of the new EWI and then fix a barge board to that so that no rain can get at the top of the render/cladding and use no undercloaks, either dry verge, cloakers, flopped verge or clocked tiles.
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      CommentAuthorfostertom
    • CommentTimeDec 30th 2019 edited
     
    rosecottage is asking first to extend the eaves - later the verges (gable ends), as tony's talking.
    • CommentAuthorGreenPaddy
    • CommentTimeDec 30th 2019
     
    Rosecottage,

    could you add a photo and or cross section sketch of the existing eaves please? It's presumably a tricky detail, or you'd have solved it already. I'm imagining you're looking for a "board" of some sort, so that it has very little thickness, but it would be better to be sure we're all understanding the same detail.
    • CommentAuthorGreenPaddy
    • CommentTimeDec 30th 2019
     
    Actually, I've just realised you have another thread with a photo, so have a better idea of the brick corbelling at the eaves.

    The other thread mentions about inuslation over the rafters, and permission to raise the ridge by up to 200mm. If that's the case, then I'm imagining the tile-line will fly past the existing eaves with up to 200mm gap to the brick?

    Can you cut off the the brick corbelling from above with an angle grinder, once the scaffold is up and roof off? That may be considered sacriledge (?), however otherwise you may be left with a zone with zero insulation as that corbelling sticks out.

    A cross section sketch, with over-rafter insulation or what ever you're planning will help us all.
  7.  
    Posted By: tonyExtend new battens out and fix a rafter to all of them outside the line of the new EWI and then fix a barge board to that so that no rain can get at the top of the render/cladding and use no undercloaks, either dry verge, cloakers, flopped verge or clocked tiles.


    Thanks Tony, this is my plan for the verges, or similar at least
  8.  
    Posted By: Nick ParsonsAlumasc/K Rend do a combined capping detail/gutter, but I think there is still a risk of thermal bridging. A lot depends on gutter height versus internal FF ceiling height.

    Not heard of this, but worth a look for the finish either way. Thanks
  9.  
    Posted By: GreenPaddyActually, I've just realised you have another thread with a photo, so have a better idea of the brick corbelling at the eaves.

    The other thread mentions about inuslation over the rafters, and permission to raise the ridge by up to 200mm. If that's the case, then I'm imagining the tile-line will fly past the existing eaves with up to 200mm gap to the brick?

    Can you cut off the the brick corbelling from above with an angle grinder, once the scaffold is up and roof off? That may be considered sacriledge (?), however otherwise you may be left with a zone with zero insulation as that corbelling sticks out.

    A cross section sketch, with over-rafter insulation or what ever you're planning will help us all.


    I think this is what I plan to do, or possible sprockets as someone recommended in my intro post. Whilst a lovely detail, they will become invisible when the EWI is on anyway. Looking a possible cut finish on an open tail to still leave some visual interest there. Thanks
  10.  
    It is easy to add interest with EWI, you just fix (with the EWI adhesive) an additional layer over the main layer and then you can use a different colour render if you want to highlight. I have used 20mm EPS on top of the main layer to make window / door surrounds which were then rendered white whilst the main body was a pastel colour. The corbelling could be imitated in the same way
    • CommentAuthorriboid
    • CommentTimeJan 2nd 2020
     
    You could extend the gable ladders out further but it would involve removing your cemented in tiles. Sounds like a big job to be honest (is there ever such a thing as a small job)?

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