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Housing - New Build: How would you close off the cavity around this window?

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  1.  
    • CommentAuthorPingy
    • CommentTimeOct 8th 2012
     
    It seemed like a good idea at the time to create splayed arched openings around the windows. I'm now trying to come up with the best technique to close off the 250mm cavity.

    Any suggestions?
      Typical window opening.jpg
  2.  
    EPS sheets attached with PU foam.
    • CommentAuthortony
    • CommentTimeOct 9th 2012
     
    Splayed, I can show you how, I have done it a lot using plasterboard! with no problems.
    • CommentAuthortony
    • CommentTimeOct 9th 2012
     
    I have also used insulated laminated plasterboard sheets too
  5.  
    How about the arched soffit? Can you bend the plasterboard in two dimensions?

    David
    • CommentAuthortony
    • CommentTimeOct 9th 2012
     
    several pieces or expamet it
    • CommentAuthortony
    • CommentTimeOct 9th 2012
     
    think it is only one dimensional bend anyway but with curved long edges
    • CommentAuthorPingy
    • CommentTimeOct 9th 2012
     
    I'd say you were right Tony that the arch is a one dimensional bend. If you took a line from any point from the top edge of the window arch and extended it to meet the blockwork arch, it would be straight. The difficult bit is at the bottom edges of the arch where there is a greater length of blockwork compared to the window.

    I was thinking of something similar to Viking House where I'd PU foam EPS into the arch cavity and effectively carve the arch profile to shape and then either PU glue strips of plasterboard to it or expamet.

    Tony, your first post is appealing. When can you come and show me?!!! :smile:
  9.  
    Posted By: PingyI'd say you were right Tony that the arch is a one dimensional bend. If you took a line from any point from the top edge of the window arch and extended it to meet the blockwork arch, it would be straight.
    That's not the way it looks to me. The blockwork arch is significantly larger than the arch formed by the top of the window frame. And the blockwork arch is significantly higher than the arch formed by the top of the window frame.

    So, if you're not going to plaster the inner face of the outer leaf, you need to either splay the plasterboard arch or build the plasterboard arch lower than the blockwork arch so that it follows the line of the top of the window frame. If you do this then it does beg the question why have the blockwork arch at all. A straight inner leaf concrete lintel could have achieved the same thing with a plasterboard arch.

    Posted By: PingyThe difficult bit is at the bottom edges of the arch where there is a greater length of blockwork compared to the window.
    I think this is the easy bit. You just carry the splayed plasterboard reveals up until they meet the plasterboard arch.

    David
    • CommentAuthorPingy
    • CommentTimeOct 11th 2012
     
    So if I was to close the arch cavity with either eps, or Celotex by cutting and gluing strips to splay the arch, would gluing plasterboard using PU foam glue directly to the insulation work? I'm presuming the plasterboard would also have to be strips to follow the arch splay? The plasterer would then plaster over and smooth out to create a smooth arch?

    I have read that it's possible to bend plasterboard into curves but I've never tried and I'm not sure if it could be done in this situation. Is this what you would do Tony?
    • CommentAuthortony
    • CommentTimeOct 11th 2012
     
    yes cut a too wide strip and leave it on a hop up at each end over the week end, make a rough tenplate with cardboard or lining paper to fit to the window frame and into the reveals, leave the front edge too big til after fixing
    • CommentAuthordjh
    • CommentTimeOct 11th 2012
     
    Posted By: davidfreeborough
    Posted By: PingyI'd say you were right Tony that the arch is a one dimensional bend. If you took a line from any point from the top edge of the window arch and extended it to meet the blockwork arch, it would be straight.
    That's not the way it looks to me. The blockwork arch is significantly larger than the arch formed by the top of the window frame. And the blockwork arch is significantly higher than the arch formed by the top of the window frame.

    I think it is a one-dimensional bend, but I don't think the piece of plasterboard has straight long edges. I think it needs to be curved like an arch itself and when bent it will take up the right shape.
    • CommentAuthorwookey
    • CommentTimeOct 12th 2012
     
    It'd be a lot easier to use hardboard or thinish plastic sheet to do the bendy part, than plasterboard. Is that plastic already taped to the window edges so you have something to connect the airtightness layer to the window with?

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