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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.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorWeeBeastie
    • CommentTimeMay 22nd 2020
     
    Is it possible to have a rough wetdash ('harling' up here) finish on EWI? I prefer the traditional textured look to the crisp smooth finish that usually comes with EWI.

    Looking to use cork boards. Not DIY!

    Thanks.
    • CommentAuthortony
    • CommentTimeMay 22nd 2020
     
    Anything is possible
    • CommentAuthorGreenPaddy
    • CommentTimeMay 23rd 2020
     
    With EWI, usually the mesh and base coat(s), which look like a grey cement, are done in readiness for the top coloured acrylic or silicone render. That top coat is just a couple of mm. I've never put harling onto that, though theoretically, it is just a hard, flat surface.

    I think the question would need to be put to the installers, as the loading of the harling would be many times more than the thin polymer render. That translates into the extra load on the EWI fixings.

    The answer is that if you have enough fixings it will be fine. The question is how do you know how many fixings is "enough".

    I suspect a cementitious harling also won't be as effective at preventing moisture ingress, so that "could" also be an issue.

    That was probably no help whatsoever!!:confused:
  1.  
    You can get the normal thin film render in a variety of grain sizes from 1mm up to 3mm with the 3mm giving a more textured finish. I have also found that putting the render on with a brush rather than a float gives more texture.

    Any advantage to cork boards rather than the standard EPS?
    • CommentAuthorMike1
    • CommentTimeMay 23rd 2020
     
    Posted By: Peter_in_HungaryAny advantage to cork boards rather than the standard EPS

    It's naturally fire resistant, a renewable resource, easily recycled, supports employment in growing, harvesting and processing, thermal conductivity not too far below EPS...
    •  
      CommentAuthorfostertom
    • CommentTime6 days ago
     
    Posted By: GreenPaddythe loading of the harling would be many times more than the thin polymer render. That translates into the extra load on the EWI fixings.
    So does brick slips but that seems to be routinely OK.
    • CommentAuthortony
    • CommentTime6 days ago
     
    For harling you could use lightweight “aggregate” eps, micafill, etc
    •  
      CommentAuthorfostertom
    • CommentTime6 days ago
     
    Leca - ideal
  2.  
    10mm canterbury spare finish on a lot of council house EWI projects round my way
    •  
      CommentAuthordjh
    • CommentTime2 days ago
     
    canterbury spar finish is a drydash though, no?
  3.  
    djh
    yes, just pointing it out to show a heavier finish is used on EWI
  4.  
    Posted By: WeeBeastieIs it possible to have a rough wetdash ('harling' up here) finish on EWI? I prefer the traditional textured look to the crisp smooth finish that usually comes with EWI.
    .


    Yes, I harled the outside of parts of my house (ICF). Used a mix of local quarried stone and Parex Maite for the slurry.
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