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    • CommentAuthordebbiel
    • CommentTimeJun 29th 2017
     
    When I submitted my building regs application I went for the conventional route of 12.5mm plasterboard throughout my timber frame house.
    I've now changed insulation from kingspan to woodfibre batts and boards which are able to be plastered with lime plaster, eliminating the need for plasterboard.
    I'm wondering what the fire rating of this would be compared with standard plasterboard, and if it would be a problem for building control.
    Has anyone else had experience with this?
  1.  
    Hi Debbiel

    I've had a similar experience with building control. They have asked me for third party certification for the external lime render. We are using a traditional mix of lime and sand, so unlikely that it has a BBA certification. I'm not sure what to do.

    Equally, we are planning on using lime plaster internally, mixed in a similar way.

    So I'd be grateful for any information too!
    •  
      CommentAuthordjh
    • CommentTimeJun 29th 2017
     
    I know that the combination of straw bales and lime plaster in my walls has a fire rating (the Germans, Austrians and Danes have done tests and I think the best result was just under two hours, but note the thickness of lime was probably a lot more than you intend). It wasn't an issue for my private firm of building inspectors. My LABC led me to believe it wouldn't have been a problem for them either, though I believe it can vary in different areas.

    I would contact your lime supplier if I were in your situation as a first attempt to find some suitable paperwork. An alternative might be to contact the conservation officer at your local council, since they deal with weirder combinations.
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