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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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  1.  
    We're using lime plaster on wood wool boards. The manufacturers say we need to use a mesh. On the flat surfaces, this works well, but on internal corners it's not straightforward to get the mesh to sit nicely. Is there a product specifically for internal corners?
  2.  
    Could you 'press' the mesh, with an iron, and a cloth between the mesh and the iron? I have always used normal mesh without any pre-folding on IWI andd EWI with wood fibre boards, and never had an issue, but when you say wood wool I am thinking Heraklith or similar, and maybe the way the render takes to the board makes it more complicated. Try the pressing trick.
  3.  
    Thanks Nick. The board is fine, I think it's probably the mesh that is a little on the large side. The pressing is an idea. Have you tried it? I guess they must use heat to get the angles on products like this:
  4.  
    https://www.backtoearth.co.uk/products/udireinforcement-3d-corner-strengthening
    •  
      CommentAuthordjh
    • CommentTimeDec 9th 2017
     
    Do you mean wood wool boards or wood fibre boards? Assuming you meant what you wrote, I'm surprised that I never saw that requirement in any documents when we were doing ours. Which manufacturer says that?

    All our windows have lime-plastered wood wool boards in the reveals, which is where the only internal corners using wood wool are. Directly plastered with no mesh - the wood wool boards provide very good keying - though there is PVC angle mesh on the external corners. We haven't had any cracking at all on the reveals. What little cracking we have had has been on largely flat parts where two materials meet (straw meets wood wool-covered timber). All those places have Intello behind the wood wool so not a problem for airtightness.
  5.  
    @djh, they are wood wool boards from Heraklith.
  6.  
    ''The pressing is an idea. Have you tried it? I guess they must use heat to get the angles on products like this:''

    Yes, that is what I had in mind, and no, I have not tried it, but I am sure it will work.
    • CommentAuthortony
    • CommentTimeDec 10th 2017
     
    Jute scrim would work I reckon.
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