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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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General: Distance to set back windows from face of external wall?

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  1.  
    • CommentAuthorkebabman
    • CommentTimeMay 24th 2014 edited
     
    I was just wondering if there is an optimum distance to set new wood windows back from the face of the external wall. i guess there is a trade off between protection from the weather and the width of the internal reveals which are to be insulated with EPS or may be aerogel. Walls are made of rubble stone between 450 and 600mm thick.
    Any suggestions please?
  2.  
    65mm rings a bell. Might be build regs ?
  3.  
    Minimum 4 inches (100mm). Offers serious protection from wind-blown rain.
    • CommentAuthorbarney
    • CommentTimeMay 24th 2014
     
    I would have said the overlap of the reveal on the frame has more effect than the depth of the reveal - although the deeper the window sits in the wall, the more shelter is gets. It also gets more shading with a loss of light and solar gain as the reveal depth increases.

    Regards

    Barney
    • CommentAuthortony
    • CommentTimeMay 24th 2014
     
    The Victorian builders generally used 100mm and lots of their windows are still there

    60's 70's80's 20mm most replaced now

    You choose, I went for 100mm
    • CommentAuthorkebabman
    • CommentTimeMay 24th 2014
     
    100mm it is then, many thanks.
    • CommentAuthordaserra
    • CommentTimeMay 25th 2014
     
    If you have CWI it should be in line with it for maximum insulation. I once saw a graph showing the performance of the window with it set at different positions; inline with insulation was by far the best (because there is no "bypass" around the insulation). In your case you intend to insulate the whole reveal so it shouldn't matter (assuming you plan to EWI the reveal) and the only concern is rain/UV. So technically as far in as possible but you may want a windowsill unless you're going for inwards opening. Ah nothing is so simple.
    • CommentAuthorkebabman
    • CommentTimeMay 26th 2014
     
    I wasn't planning to EWI the reveal. The external face of the grade II listed house is unrendered rubble stone but all of the external reveals have been covered in cement forming an angled fillet thickening to the existing frames that are to be replaced.I was thinking of removing this fillet to leave the exposed stone. I guess I could recreate the fillet and have maybe some angled insulation covered by lime if that was doable.
    Appearance wise I think bare stone would be best but I am very keen to get the house as energy efficient as possible.
    •  
      CommentAuthordjh
    • CommentTimeMay 28th 2014
     
    Posted By: tonyThe Victorian builders generally used 100mm and lots of their windows are still there

    60's 70's80's 20mm most replaced now

    The Victorians are also said to have had better timber and also had lead paint that isn't used now. Having said that, I'm going for 100 mm or so too.
    • CommentAuthortony
    • CommentTimeMay 28th 2014
     
    It wasn't the lead so much as the linseed oil base that happened to be breathable! their wood was better though - yes

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